( )在中低水头、大流量水电站中得到广泛应用。
A．混流式水轮机
B．轴流式水轮机
C．斜流式水轮机
D．贯流式水轮机
参考答案：B
癫痫
23. Everyone should remember it is very important to _____ the balance of nature toady.
A．get
B．make
C．keep
D．Remain
