对于需要泵房直接挡水大型机组，为增大泵房的稳定性，一般建（）。
A.分基型泵房
B.干室型泵房
C.湿室型泵房
D.块基型泵房
参考答案：D
It is the second time that he has won the race, _______ has surprised us all.
A．which
B．where
C．what
D．that
桥上护轨每个接头至少用4个接头螺栓联结，螺母应在轮缘槽内侧。
