题目内容

Many ways have been found______small and simple machine to process large and complicated machine parts.

A. by using
B. to use
C. using
D. used

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The new hotel has erected a beautiful building with recreation area and conference facilities on the top floor______the finest view of the city can be obtained.

A. in which
B. over which
C. where
D. there

叶面积指数与群体光和作用间的关系下列描述正确的是。
A叶面积指数(LAI)越大，群体光合作用(PGC)也越强
B二者没有任何关系
C叶面积指数(LAI)越大，群体光合作用(PGC)也越弱

红外阻隔膜保温性能好，最低达到3～8℃。()

【C4】

A. requested
B. supposed
C. insisted
D. expected