为了保证检修动火和罐内作业的安全，检修前要对设备内的易燃易爆、有毒气体进行（）。
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When two AC generators are being paralleled, the breaker should be closed with the synchroscope pointer mating in the （）
A. "slow" direction, just before the 12 o'clock position
B. "fast" direction, just after the 12 o'clock position
C. "fast" direction, just before the 12 o'clock position
D. "slow" direction, just after the 12 o'clock positio
整流罩哪个部位需要防冰？（）
A. 所有部位
B. 仅有外部蒙皮
C. 前缘
D. 都不对
一般情况下计算机第一分区的起始扇区是（）。
A. 2
B. 63
C. 64
D. 32
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