正确答案: B

15-30

题目：绞缆机绞缆速度一般为()m/min。

解析：B

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举一反三的答案和解析：

[单选题]A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.

changing directions of exhaust gas flow

[单选题]所有梯道、走廊和起居处所内脱险通道要求的感烟探测器应在烟密度超过______每米减光率之前动作。但在烟密度超过_____每米减光率之前不应动作。

12.5％/2％

[单选题]苯的特性具有()。

易燃、易挥发、毒性强

[单选题]The difference between measured and desired values is called

deviation

[单选题]Due to action of pistons some relative motion between parts in contact in the coolant supply and return system must occur.

reciprocating

[单选题]特急性颅内血肿是指受伤后______出现脑受压或脑疝症状。

3小时