凝汽式透平停车时,复水系统空冷器的停车时间是()。
A、与透平同时
B、透平尾气温度≤40℃以后
C、透平尾气温度降到环境温度
D、空冷器出口温度≤40℃以后
参考答案:B
根据本文,动植物也需要:
A.有朋友在身边
B.每天交流信息
C.给同伴们发信
D.接收同伴信息
____________his poor English, I’m afraid he can’t make himself ________ if he goes to America alone.
A.Because of, understood
B.As, to understand
C.Because, understand
D.Because of, to understand