耐火电缆就是在火燃烧情况下仍能在规定的时间大约( )h内保持通电的电缆。
A.2
B.8
C.12
D.4
参考答案:D
The ultimate cause of the Civil War was the bombardment of Fort Sumter.
A.only
B.final
C.true
D.special
简述绘制现场图的要求?