机组在甩负荷过程中,转速和水压均上升过大,其原因可能是。()
A.水轮机与实际水头不适应;
B.主配压阀放大系统过大;
C.导叶关闭时间太短;
D.二段关闭时间太短。
参考答案:A
--Everyone says that there is no chance for me to win the competition.
--- ______. Believe in yourself.
A.Maybe
B.That’s all right
C.Don’t let them get to you
D.OK
最低有效密度