与其他施工方法相比,滑升模板施工的优点是()。
A.耗钢量少
B.装置投资少
C.节省劳动力
D.节约冬季施工费
参考答案:A
I ____ an expensive gift for my birthday, but I could not ____ it.
A.accepted, received
B.received, accept
C.accepted, receive
D.accepted, received
当泵的扬程一定时,增加叶轮()可以响应的减少轮径。
A、转速
B、流量
C、功率
D、效率