题目内容

聚乙烯透过太阳辐射能力优于聚氯乙烯，但，聚乙烯保温性能较差，棚内日温差大。()

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

A. by using
B. to use
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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.

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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℃。()