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【单选题】
Before switching on gyro-compass, you should make sure that the power supply on board is ______.
A.
high or low
B.
AC or DC
C.
strong or weak
D.
on or off
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【单选题】听力原文：W: I wonder if there's a difference in work attitude--working in a small company or working for a big company. M: Yes, sure there're differences. I guess that you're more...uh...conscious of time...
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subversion
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impulse
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