题目内容

How can we help to reduce greenhouse gases when using computers?the computer when we are through with it; put it on stand-by when we leave it for a while.

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How can recycling help in protecting the environment?When people recycle, theyproduce less trashand help .

What are the little things we can do to make a difference? List some.Saving 1 , using2, riding3, taking buses and walking, planting trees, recycling, taking corporate actions, learning more about global warming, joining environmental groups, etc.

摆放光路时，应当使物光光程和参考光光程

A. 尽量相等
B. 差别最大

物光和参考光的夹角应当

A. 约等于90度
B. 约等于30度
C. 越小越好