The phrase "to sign on"(Line 2, Para. 2)most probably means______.
A. to check on the availability of jobs at the jobcentre
B. to accept the government"s restrictions on the allowance
C. to register for an allowance from the government
D. to attend a governmental job-training program
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收放机各转动部应用______油或______润滑油。
发动机的最佳点火时间是活塞到达压缩行程的上止点时。()