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单项选择题

非基变量的检验数一定为0.
A、正确
B、错误

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单项选择题
单项选择题
镜头主要光学特征的三个参数：焦距、相对孔径、视场角。
A、正确
B、错误
未知题型
Pollution has become a serious problem in almost all the big cities of the worlD.City people are becoming more and more worried about how they can【11】pollution. They are also concerned about whether the government is doing enough to【12】the environment. However, people in Ireland don't have these worries. They are sure that they have found the【13】the problem. They use windmills. These windmills can create power without【14】pollution. This method is so successful that other countries are【15】doing the samE.Why not? What works for Ireland can work for any other country.
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