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默认打印机的数量应该是（）个。

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影响改编的因素有哪些？

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保护跳闸出口压板投入前应（）

A. 测量压板两端电压正常
B. 测量压板两端对地电压正常
C. 测量压板一端对地无电压，另一端对地负电压

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锚链、刮板输送机必须配有哪些保护装置？

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In the Northern Hemisphere you are caught in the dangerous semicircle of a storm with plenty of sea room available. The best course of action is to bring the wind on the（）.

A. port quarter and make as much headway as possible
B. starboard quarter and make as much headway as possible
C. starboard bow and make as much headway as possible
D. port bow and make as much headway as possible

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