【填空题】
22165.___传感器的转换元件是指传感器中能直接感受或响应被测量的部分。
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【填空题】
22174.___数字式位移传感器有光栅、磁栅、感应同步器等，它们的共同特点是利用自身的物理特征，制成直线型和圆形结构的位移传感器，输出信号都是脉冲信号，每一个脉冲代表输入的位移当量，通过计数脉冲就可以统计位移的尺寸。
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( ) 28. What does "The little Prince" mainly talk about? It' s about _________．
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【单选题】
( ) 29. When a baseball player hits the ball, he must ______ to get a point.
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【单选题】
( ) 30. When was the importance of touching all the bases shown?
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【单选题】
( ) 31. Who hit home run number 715?
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【单选题】
( ) 32. What does the expression “to touch all bases” mean?
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【单选题】
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【单选题】
( ) 34. Usually the weather in the wetlands is _______．
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( ) 35. The World Wetlands Day is on _______．
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【单选题】
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【单选题】
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【单选题】
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【单选题】
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