转浆式水轮机在机组停机后，轮叶都开到一个启动角度，其目的是（）。
A.缩短开机时间；
B.增大开机时间；
C.增大机组出力；
D.减少水力损失
参考答案：A
—Haven't I seen you some place before?
—Yes. That's ________ I don't go there anymore.
A．because
B．how
C．why
D．when
