题目内容

Bermuda Triangle is the best place for Beings from outer space because it is quite suitable for them.

A. Y
B. N
C. NG

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The triangle has been a source of mystery for about thirty years.

A. Y
B. N
C. NG

Despite great public interest in the triangle, no theory has yet been suggested to explain

A. Y
B. N
C. NG

红外线辐射对机体的影响主要是()。

A. 皮肤
B. 皮肤和眼睛
C. 眼睛
D. 内脏

烟花爆竹生产过程中，机器生产硝酸盐引火线时，每间工房不得超过()台机组，工房内药物停滞量不得超过()kg。

A. 1；1
B. 2；1
C. 1；2.5
D. 2；2.5