东风8B型内燃机车采用的4Q51型电空接触器传动部分的气缸活塞行程为()。
A、23.8mill
B、25mnl
C、26.2nlin
D、27.6l’nnl
参考答案:A
流行性乙型脑炎(乙脑)的主要传染源是()
A.黑线姬鼠
B.蚊子
C.猪
D.患者
E.患者和隐性感染者
根据首字母或汉语提示写出单词。
1. The man noticed two policemen coming t______ him.
2. There are several d______ for New York every day.
3. This is the first s______ for you to succeed.
4. She ______ (点头) to us as she walked by.
5. Horses were the only means of ______(交通方式).