在混凝土拌合物中,外加剂的掺入量一般不大于水泥质量的()。
A.5%
B.10%
C.15%
D.25%
参考答案:A
The radio says it _____ later in the day, then we can go out to play.
A.stops to rain
B.stops raining
C.will stop raining
D.will stop to rain
如图所示的工具中,属于费力杠杆的是[ ]
A.钢丝钳
B.起子
C.羊角锤
D.镊子