坝体接缝灌浆用水泥浆液的水灰比序列为()。
A.与帷幕灌浆相同;
B.与固结灌浆相同;
C.1:1、0.6:1;
D.2:1、1:1、0.6:1。
参考答案:D
--- Everyone says you are a good student. You never fall asleep in class?
--- .
A.Yes, sometimes
B.Yes, I did
C.Yes, never
D.No, I didn’t
活塞式4M12-45/210各符号表示的意义?