单项选择题

关于图所示结构Ⅰ、Ⅱ的ab跨跨中挠度ΔⅠ、ΔⅡ，说法正确的是（　　）。

A.ΔⅠ＞ΔⅡ
B.ΔⅠ＜ΔⅡ
C.ΔⅠ＝ΔⅡ
D.无法判断

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单项选择题

图所示悬臂梁截面12cm×20cm，受弯允许的应力为[σ]＝1.0kN cm2，则荷载P应不大于（）。

A.4.0kN
B.6.0kN
C.8.0kN
D.10.0kN

单项选择题

What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received ________．A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequencyB.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was receivedC.The Operator should immediately set continuous watch on VHF channel 70D.The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received

A.A.No
B.The
C.The
D.The

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