配制自密实混凝土宜采用连续级配或2个及以上单粒径级配搭配使用,最大粒径不宜大于()。
A.16mm
B.20mm
C.25mm
D.30mm
参考答案:B
It ______ heavily when he got back home for he was wet all over.
A.was raining
B.must have been raining
C.must be raining
D.rained
下列程序段的执行结果为( )。 X=2 Y=5 If X * Y <1 Then Y=Y - 1 Else Y=-1 Print Y-X>0
A. True
B. False
C.-1
D.1