遇大雨、冰冻等异常气候之后，应检查石砌体是否产生了移位，是否有不均匀下沉等现象。
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某船排水量6402t，KG=7.4m，GM=0.67m，现拟在KP=1.3m处加压载水将GM调至0.80m，则应打进压载水（）t。
A. 139
B. 175
C. 187
D. 199
乾隆皇帝野宴蒙古王公、班禅六世、并接见英国使臣马夏尔尼的地方在避暑山庄的哪里？
What is the first thing that happens when IPv6 is enabled on an interface on a host？（）
A router solicitation is sent on that interface.
B. There is a duplicate address detection on the host interface.
C. The link local address is assigned on the host interface.
D. A neighbor redirect message is sent on the host interface.
调和平均数是根据（）来计算的，所以又称为（）平均数。
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