题目内容

门座式起重机的驱动装置不包括()。

A. 车轮
B. 电动机
C. 制动器
D. 减速器

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型号为TQ60/80的塔吊的配重臂的臂长()米。

A. 6
B. 8
C. 10
D. 12

影响塔吊稳定的因素有风力、轨道坡度、平衡重及()等。

A. 自重
B. 作业人员
C. 斜吊重物

A suitcase with shirt, trousers and shoes __________ stolen from the car

A. have been
B. has
C. was
D. are

They talked in whispers, but still, I couldn’t help but __________ their conversation

A. overhear
B. to overhear
C. overhearing
D. overheard