一船转速不变，如果船速降低，则（）.
A、滑失越大；
B、发出的推力越大；
C、主机负荷越大；
D、以上都是。
参考答案：D
Mary's ____ brother is a doctor. He is four years ____ than her. [ ]
A. older; elder
B. elder; elder
C. elder; older
D. older; older
普通决议
