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【单选题】
用401胶粘金属边框时，胶需刷（），第一遍胶干到不粘手时再刷第二遍，不要过于急躁。
A.
两遍
B.
三遍
C.
四遍
D.
一遍
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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.