高功率微波武器是一种定向能武器。
参考答案:对
The other day we traveled fifteen hours to a magic country. which America,and we enjoyed ourselves
there for a month. [ ]
A. was called
B. is called
C. had been called
D. has been called
制冷机运行时用()冷却氟利昂,氟利昂冷却乙二醇。
A.冷却循环水
B.氟利昂
C.铵
D.油