单项选择题

A. 0.449V
B. 0.249V C. 0.998V D. 0.125V

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单项选择题

A.4A，供出功率B.4A，吸收功率C.-4A，吸收功率D.-4A，供出功率

A.4A，供出功率
B.4A，吸收功率
C.-4A，吸收功率
D.-4A，供出功率

单项选择题

The section of each end of a barge which is heavily reinforced to take the pressure of pushing is called the ______．A.HeadlogB.TowheadC.Collision bulkheadD.Bullnose

A.A.Headlog
B.Towhead
C.Collision
B.Bullnose

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