柴油机工作时，柴油直接喷入气缸是通过（）。
A.进气管
B.输油泵
C.喷油泵
D.喷油器
参考答案：D
若线段MN=10cm，Q是直线MN上一点，且线段NQ=5cm，则线段MQ长是______cm．
用所给词的适当形式填空。
1. This was his _____ (two) time to cook.
2. It's hard for me_____ (drive)a car.
3. Mark is a _____ (Russia) and he lives in Russia all his life.
4. She doesn't have any _____ (hobby). But she likes studying very much.
5. I hear some _____ (foreign) will visit our school next week.
