账簿中书写的文字和数字上面要留有适当空格,不要写满格,一般应占格距的()。
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各项施工要按规定控制慢行距离和慢行速度,桥涵顶进施工慢行限制速度为()km/h。
A. 15
B. 25
C. 45
(APS2000)APU超速的转速是多少()
A. 105﹪
B. 106﹪
C. 109﹪
D. 110﹪
银行结算账户档案的保管期限为()。
A. 账户开户后永久保管
B. 账户开户后10年
C. 账户撤销后10年
D. 账户撤销后20年
Small floes of rough,hummocky sea ice capable of damaging a vessel().
A. can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometers
B. are indistinguishable from sea return on the PPI
C. are invisible to radar when covered with a thick layer of snow
D. are usually seen at night before they are close enough to provide a radar echo