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【单选题】
多层建筑光分纤箱安装高度距地面()米左右,施工人员应充分考虑装机人员与用户需求,优先考虑用户线正常接入。___
A. 1.8-2.0
B. 2.2
C. 3.2-3.6
D. 3.6-4.0
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答案
B
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分道行驶时,电动车须在()行驶。___
A. 机动车道
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服务积分和质量积分总分均为()分___
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杆上作业时,距杆根半径()米内不得有人。___
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杆上作业时必须先扣好安全带,安全带应固定在距杆梢()米下面的安全可靠处。___
A. 0.2
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高处作业时,所用工具、材料应放置稳妥,不得()。___
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高空作业时,所有材料应放置稳妥,所用工具总重量不准超过()。___
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工程挂测中,线路质量挂测的验证内容:二级分光器出光功率必须大于等于()dBm。___
A. -22
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C. -24
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工程上常用的光纤熔接接头的增强保护措施是()。___
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工具安全检查主要是检查()是否良好___
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故障处理及时率的计算方法是用()数据除以派发的故障投诉的工单数量。___
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B. 及时受理故障投诉的工单数量
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关于维护作业施工中,下列说法不正确的是()。___
A. 发现机柜有积水,有可能造成短路时,应立刻关闭电源
B. 如遇恶劣天气应立即停止室外作业
C. 带电操作时,作业人员应取下手表、戒指等金属饰品
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光功率的单位是()。___
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光缆(光皮线)对地最小距离:3、4级公路为()米___
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光缆的弯曲半径应不小于光缆外径的15倍,施工过程中应不小于()倍。___
A. 10
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C. 20
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【单选题】
光缆吊挂,挂钩间距为()mm,允许偏差±50mm。___
A. 400
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光缆分纤箱安装时,分纤箱的箱体下沿距离地面应不低于()m,以减少人为影响。___
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【单选题】
光缆分纤箱以壁挂方式安装时,不可设置于()。___
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光缆敷设时,()米的长杆档,两侧电杆上各预留光缆6~8米。___
A. 61-100米
B. 81-150米
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D. 151-250米
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光缆敷设时,盘放预留光缆的弯曲半径应不小于光缆外径的()倍。___
A. 15
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光缆交接箱编号原则:小区名称+()+两位数字序号。___
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光缆交接箱成端时,主干光缆应成端在光缆交接箱的()。___
A. 中间部分
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光缆交接箱基础与人手孔之间用20mm的半硬塑管连接,分为前后2排,分布在基础的合理位置,便于()。___
A. 光缆成端
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D. 光缆接头
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光缆交接箱接地用16m㎡()的多股铜芯线。___
A. 黄绿相间
B. 黄色
C. 红色
D. 绿色
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光缆交接箱内,光缆与接地线应()引入,弯曲半径不得小于线缆的最小弯曲半径,不得损伤线缆护层,进入光缆交接箱的线缆禁止裸露在外。___
A. 同孔
B. 分孔
C. 同向
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光缆交接箱内成纤盘成端光纤熔接完后,裸纤长度不小于()cm。___
A. 30
B. 40
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光缆交接箱已开破的进缆孔全部用()进行封堵,并做到整体平整,表面光滑。___
A. 水泥
B. 纸板
C. 玻璃胶
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光缆入箱必须设置吊牌,吊牌吊挂在光分纤箱外()mm处的光缆上。___
A. 50
B. 100
C. 200
D. 300
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光缆损耗主要是由光纤本身、连接部件和()造成的。___
A. 外界环境
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光缆引上时,必须有()米以上的钢管保护,并且钢管内光缆要穿子管防护。___
A. 2
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光缆引上应用钢管保护,光缆出入钢管口用塑料保护管防护,保护管伸出钢管口()mm。___
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光缆在交接箱内固定时,应将加强芯穿进螺丝固定孔内,将螺丝拧紧,预留钢丝长度不超过()cm。___
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光缆在进光缆交接箱接箱处须要做预留,预留线上吊牌位置为预留圈的()。___
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光缆在经过某些特殊位置时,必须绑扎牢固,同时用保护管进行保护,这些位置不包括()。___
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光纤的()就是光纤受到不均匀应力的作用,光纤轴产生的微小不规则弯曲.其结果是传导模变换为辐射模而导致光能的损耗。___
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D. 耦合损耗
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光信号是以光功率来度量的,一般以为单位()。___
A. dBm
B. dB
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互联网协议中的()被认为是不可靠的机制,因为它不保证数据发送成功。___
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is sold especially to the upper or upper-middle class and it has a reputation for its serious attitude and great bulk.
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About of American crops are for export.
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The first National Bank of the United States was established with the urge of .
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Chartered companies were NOT granted the by the British King or Queen.
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The modern American economy progressed from to , and eventually, to .
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America produces a major portion of the world’s products in the following fields except .
A. A. machinery
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The President is directly voted into office by .
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The Supreme Court is composed of justices.
A. A. six
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The terms for a Senator and Representative are and years respectively.
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According to the Constitution, a candidate for President must be .
A. A. at least 35 years old
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The following except are all powers of the President.
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【单选题】
All the following except cannot make legislative proposal.
A. A. the Senator
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【单选题】
The following except are guaranteed in the Bill of Rights.
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【单选题】
The Bill of Rights .
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The Constitution of the United States .
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The U. S. Constitution came into effect in .
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President applied New Deal to deal with the problems of the Great Depression.
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Abraham Lincoln issued to grant freedom to all slaves.
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In May 1775, was held in Philadelphia and began to assume the functions of a national government.
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The first shots of the American dependence were fired in .
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“No taxation without representation” was the rallying slogan of .
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The Seven Years’ War occurred between the .
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Pilgrim Fathers are a group of who came to America to avoid persecution in England.
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The first successful English colony in North America was founded at in .
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The characteristic of dominant American culture is .
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The ImmiWar of Ingrants Act of 1924 restricted the further immigration into the United States, particularly from .
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