单项选择题
所示屋顶挑檐剖面计算简图中,在荷载P作用下,根部A点所受力矩的正确值是哪项?( )
A.2kN·m
B.4kN·m
C.kN·m
D.kN·m
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单项选择题
It is dangerous for vessels without the use of radar ______ the estuary.A.To getB.To approachC.To proceedD.To close
A.A.To
B.To
C.To
D.To
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单项选择题
A compass card without north-seeking capability that is used for relative bearings is a(n)______.A.Bearing circleB.PelorusC.Bearing barD.Alidade
A.A.Bearing
B.Pelorus
C.Bearing
C.Alidade
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