单元机组的滑参数启动的优越性?
参考答案:
⑴缩短启动时间。⑵增加了机组的安全可靠性。⑶能提高经济性。
____Do you mind if I open the windows?
_____ ______ I feel a bit cold.
A.Of course not
B.I'd rather you didn't
C.Go ahead.
D.Why not?
制备蜡丸时用的辅料为()
A.蜂蜡
B.石蜡
C.液体石蜡
D.川白蜡
E.地蜡