为了节约水泥,可在混凝土中加入石块,但加入的数量宜控制在一定比例,这种混凝土称为()。
A、碎石混凝土
B、片石混凝土
C、料石混凝土
D、素混凝土
参考答案:B
“thanks” is polite when someone has done you a favour, but saying it too often is quite another thing.
A.Though saying
B.If saying
C.Saying
D.In spite of saying
溃疡性结肠炎的病变大多位于()。
A.空肠
B.末段回肠
C.回盲部
D.全结肠
E.直肠、乙状结肠