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刷刷题刷刷变学霸
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【单选题】第二篇 Sleep We all know that the normal human daily cycle of activity is of some 7 - 8 hours’ sleep alternating with some 16 - 17 hours’ wakefulness and that, broadly speaking, the sleep n...
A.
people hate the inconvenience of working on night shifts.
B.
your life is disturbed by changing from day to night routines and back.
C.
not all industries work at the same hours.
D.
it is difficult to find a corps of good night workers.
【单选题】为了增大常规潜艇的水下续航力，在潜艇上增加一个舱段安装AIP系统，它采用（）。 ①电力传动装置； ②燃料电池； ③小型核动力装置
A.
①②
B.
③
C.
②③
D.
①②③