主要应用于建筑工程平面控制网水平距离的测量及测设的水准仪是()。
A. 激光准直仪
B. 光学水准仪
C. 光学经纬仪
D. 全站仪
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（）of the following need not be entered in the official logbook?
A. The testing of the internal combustion engine driven emergency generator at least once each month the vessel is navigated
B. The testing of storage betteries for emergency lighting and systems once each 6 months the vessels is navigated
C. The actual draft when the vessel arrives in salt water after department a port
D. The testing of the line-throwing appliance once every 3 month
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