12 do you suppose he asked for them?
A. What
B. How
C. Who
D. Which
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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
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