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什么叫重力？重力的方向是什么？重力的单位是什么？

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扑救容器内液体着火时为什么不能直接对准燃烧液面进行扑救？

A green buoy has a yellow triangle on it. This is a(n)（）.

A. information or regulatory buoy that has lateral significance
B. buoy that is off-station and is marked to warn mariners of its wrong position
C. dual purpose marking used where the ICW and other waterways coincide
D. buoy that was set in error and will be replaced with a red nun buoy

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NPN三极管的集电极电流是总电流，它等于发射极和基极电流之和。

A. 正确
B. 错误

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票据的持票人以背书的连续，证明其票据权利。

A. 正确
B. 错误

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