当钢筋混凝土梁高h>( )时,应设腰筋。
A.500mm
B.600mm
C.700mm
D.800mm
参考答案:C
_____ drive too fast .We have enough(足够的)time to get there.
A. Not B. Don’t C. doesn’t
中空玻璃的高温高湿耐久性能是怎样规定的?