问题
单项选择题
在驾驶台遥控主机时，当把车钟手柄从全速正车一下推向全速倒车，遥控系统首先进行的动作是（）。
A.停油
B.换向
C.打开主起动阀
D.脱开盘车机
答案
参考答案：A
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在驾驶台遥控主机时，当把车钟手柄从全速正车一下推向全速倒车，遥控系统首先进行的动作是（）。
A.停油
B.换向
C.打开主起动阀
D.脱开盘车机
参考答案：A
| 完形填空。 | ||||
| It's March now. It's time 1____________ plant trees (植树). Today is the 2nd of March. The students of 2____________ are planting trees. Some are 3____________. Some are carrying water. 4____________ are watering the trees. All of the students are busy. 5____________ hard all the students are working! They are helping to make our country beautiful.
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