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问题 判断题

轴心受拉构件是指外力的作用线通过构件截面的重心，并与轴线相重合的构件。( )

答案

参考答案：对

单项选择题

Open Shortest Path First(OSPF)is a (71) routing algorithm that (72) work done on theOSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing,requires (73) processing power. The (74) algorithm is used to calculate mutes. OSPFrouting table updates only take place when necessary, (75) at regular intervals.

A．more

B．less

C．same

D．most
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选择题

室温下，VaLpH=a的强酸与VbLpH=b的强碱溶液混合，混合后溶液pH=3。已知a+b=13,Vb=4.5Va ,则a值为                          

A．2

B．3

C．4

D．5
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