【判断题】
维生素C可促进胶元的形成,有益于伤口的愈合、止血。
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膳食中的维生素C主要来源于新鲜的蔬菜和水果。
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维生素C是脂溶性维生素,多服不会中毒。
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导致“脚气病”的重要原因是缺乏维生素B1。
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阳光中的紫外线照射到皮肤上可生成维生素D 。
A
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维生素D对幼儿物骨骼和牙齿发育起重要作用,应多多益善。
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按照大班幼儿20公斤计算,每天一个幼儿一天大约需要喝1800毫升水,是指幼儿一天必须喝1800毫升水。
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水是营养素的良好溶剂,能使多种物质溶解,而且流动性大,能在体内形成体液循环运输物质。
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水是机体关节、肌肉及内脏器官的“润滑剂”,润滑体内的摩擦部位,减少损伤,对人体器官起着一定的保护作用。
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碳水化合物又称糖类,是由碳、氢、氧三种元素构成的一类化合物。
【判断题】
碳水化合物是三种产能营养素中来源最丰富、最经济实惠和供能最主要的营养素。
【判断题】
膳食中可利用碳水化合物是人类最经济、最主要和最有效的能量来源。
【单选题】
电气化铁路沿线路内外各单位需组织学习本规则的相关内容。电气化铁路相关作业人员___至少进行一次安全考试,考试合格后,方准参加作业。.
【单选题】
距牵引供电设备支柱及牵引供电设备带电部分___范围以内具备接入综合接地条件的金属结构应纳入综合接地系统。
【单选题】
天桥、跨线桥靠近或跨越___的地方,须设置防护栅网。
【单选题】
新建电气化铁路在牵引供电设备送电前15天,___应将送电日期通告铁路沿线路内外各有关单位。
A. 建设单位
B. 集团公司
C. 沿线各单位.
【单选题】
行人持有长大、飘动等物件通过道口时,不得高举挥动,应与牵引供电设备带电部分保持___以上的距离。
【单选题】
6绝缘靴、绝缘手套等安全用品,应___进行一次绝缘耐压试验,并存放在阴凉干燥、防尘处所。
【单选题】
电气化铁路区段各车站给水线、电力机车整备线和动车组整备线,在分段绝缘器内侧___处应设安全区域标志。
【单选题】
距牵引供电设备带电部分超过___的燃着物体,使用沙土灭火时,牵引供电设备可不停电,但须保持灭火机具及沙土等与带电部分的距离在2m以上。
【单选题】
隔离开关操作人员须经过培训并取得由___颁发的安全操作证后,才能担任工作。
A. 各自单位
B. 供电设备管理单位
C. 集团公司.
【单选题】
通过道口车辆限界及货物装载高度(从地面算起)不得超过___,超过时,应绕行立交道口或进行货物倒装。
【单选题】
动力室门、电气室门应随开随关,注意防止___手指。
【单选题】
禁止使用___照明检查机车,动力室、高压室内严禁烟火。
【单选题】
凡机车停在接触网下,在未接到___的停电命令和挂好接地线前,严禁登上车顶。
A. 列车调度员
B. 供电调度员
C. 车站值班员.
【单选题】
电流通过人体的途径中___是最危险的电流路径。
A. 从左手到前胸
B. 从右手到脚
C. 从右手到左手.
【单选题】
1211灭火器灭火率比二氧化碳灭火器高___倍。
【单选题】
登上车顶作业,必须采取安全措施和配戴___。
【单选题】
禁止带电接触高压导线和各种有电设备的___。
【单选题】
柴油机发生抱缸或差示压力计作用时,在未判明原因前,不应立即进入___,不可马上进行检查,以防灼伤或其他危险。
【单选题】
在___作业时,必须执行呼唤应答制度,禁止身体各部位跨、靠制动系统和其他部件。
【判断题】
隔离开关操作前,操作人必须按规定穿戴好绝缘靴和绝缘帽,确认开关及其操作机构正常,接地线良好,方准按程序操作。
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The pressure ___causes Americans to be energetic, but it also puts them under a constant emotional strain.
A. to compete
B. competing
C. to be competed
D. having competed
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Having decided to rent a flat, we ___ contacting all the accommodation agencies in the city.
A. set about
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The old couple decided to ___ a boy and a girl though they had three children of their own.
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I will___ Mr. Walters on this point.
A. refer to
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What happens in the next few days is___to our success.
A. critical
B. critic
C. prior
D. valid
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She won’t___that there is a problem.
A. confer
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This offer is___ for travel before the end of April.
A. effective
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___ to British universities depends on examination results.
A. Admittance
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The database is only ___ by authorized managers.
A. proved
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This traditional ___ is of indigo blue.
A. clothes
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These cigarettes are a ___ of the best tobaccos.
A. blend
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The tennis players need total ___ during play.
A. concentration
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He ___ that he was innocent.
A. announced
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Columbus discovered America but did not ___ the new continent.
A. seek
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The trees ___their foliage every year.
A. repeat
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Make a list of the various ___.
A. options
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I am well aware that this is a ___ job.
A. rough
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I found their kindness quite ___.
A. strong
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C. keen
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The captain wasn’t ___ on having him in the team.
A. eager
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He was ___at the prospect of seeing them again.
A. thrilling
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They ___ against travelling at night in such a dangerous country.
A. consul
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It is absolutely vital that food supplied should be ___.
A. sustained
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He must have had an accident, or he ___ then.
A. would have been here
B. had to be here
C. should be here
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It was essential that the application forms ___ back before the deadline (截止日期).
A. must be sent
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We ___ our breakfast when an old man came to the door.
A. just have had
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The bridge was named ___ the hero who gave his life for the cause of the people.
A. after
B. with
C. by
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It wasn’t such a good dinner ___ she had promised us.
A. that
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C. as
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The road now ___two kilometers beyond the river.
A. develops
B. extends
C. expands
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It was claimed that the level of alcohol in the man’s blood was ___ to cause an accident.
A. sufficient
B. adequate
C. enough
D. accurate
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Medical care reform has become this country’s most important public health ___.
A. question
B. stuff
C. matter
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His retail business in the city___ rapidly between the wars.
A. enlarged
B. extended
C. widened
D. expanded
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Many frogs ___ the sound of their voice using special sacs(囊) in their throat.
A. amplify
B. widen
C. expand
D. enlarge
【单选题】
Some old people don’t like pop songs because they cannot ___ so much noise.
A. resist
B. sustain
C. tolerate
D. undergo
【单选题】
I have kept that portrait where I can see it every day, as it always ___ me of my university days in London.
A. recollects
B. reminds
C. recalls
D. invokes
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The article suggests that when a person is under unusual ___ he should be especially careful to have a well-balanced diet.
A. weight
B. stress
C. press
D. nerve
【单选题】
You should hire a more ___ manager than the one you currently have.
A. sufficient
B. effective
C. respective
D. efficient
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Surgeons began to ___ their hands and arms with soap and water before operating.
A. scrub
B. enhance
C. rub
D. exhibit
【单选题】
He might let something ___ in a moment of weakness.
A. slip
B. leak
C. to slip
D. to leak
【单选题】
Do not ___ the salad until you are ready to serve.
A. mix
B. toss
C. fling
D. eat