汽轮机的常见保护系统包括（）。
A.超速保护
B.轴向位移保护
C.低负荷保护
D.低油压保护
参考答案：A, B, D
Write the words in correct order. 连词成句。
1. is, playing, exercise, basketball
2. how, every, often, you, go, do, to, school, week
3. have to, play, for, sports, exercise, you
4. always, my, lunch, I, make
5. works, very, Kim, hard
植物造景中色彩三补色为（）。
A、红、绿、黄
B、橙、绿、紫
C、红、黄、蓝
