填空题

A. too much energy
B. based on American designs
C. they are too costly
D. they are not reliable
E. quality control
F. free of charge
The use of robots increases ___________.

【参考答案】

E
<上一题 目录 下一题>
热门 试题

单项选择题
The first scientific air flight was designed by()

A. a Greek.
B. an Englishman.
C. a Chinese.
D. an Italian.
单项选择题
53（）

A.convey
B.acquire
C.modify
D.prove
相关试题