单项选择题

基础知识,章节练习,土木工程师(水利水电)现代技术基础,电气技术基础

A.
B.
C.
D.
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单项选择题
一般无机非金属材料导热系数低于金属材料的原因是( )
A.缺少离子
B.缺少自由电子
C.孔隙率高
D.光子数少
单项选择题
One function of a bulwark is to ______.A.Help keep the deck dryB.Prevent stress concentrations on the stringer plateC.Protect against twisting forces exerted on the frame of the vesselD.Reinforce the side stringers
A.A.Help
B.Prevent
C.Protect
D.Reinforce
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