题目内容

在井筒内用罐笼运送乳化炸药时，罐笼的升降速度不得超过()m/s。
A 1
B 2
C 3
D 4

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the 11 man who came in was blind. He wanted scissors（剪刀）.

A. clever
B. other
C. right
D. next

井下用机车运送爆炸材料时，列车的行驶速度不得超过()m/s。
A 1
B 2
C 3
D 4

He 10 his head and pointed to the two fingers

A. nodded
B. raised
C. shook
D. turned

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A. cutting
B. hammering
C. waving
D. Circling