金属板材防水屋面，采用镀锌钢板作天沟时，其镀锌钢板应伸入金属板的底面长度不应小于______mm。
A．100
B．75
C．50
D．20
参考答案：A
--- Could you introduce me a high quality car?
--- My pleasure. ____ well even on wet roads, this kind of car is very popular.
A．Handled
B．To handle
C．Handling
D．Being handled
价格随着品质的高低而上下浮动。( )
