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It is easy for those who are unaffected by the powerful draw of connectivity – those who can easily control their time online – to view Internet addiction as an imaginary problem or to attribute its origins to a weak personality. Is this sentence a fact(F) or an opinion(O)? 只需填写F或者O.

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The Internet is a powerful tool, but make sure that you use it wisely for all the good value it offers and that you won’t let too much of a good thing become something bad. Is this sentence a fact(F) or an opinion(O)? 只需填写F或者O.

顾客购买总成本包括（）

A. 货币资金与精神成本
B. 时间成本与体力成本
C. A、B两项都包括
D. 以上都不全

关于黑光灯,正确的是:

A. 黑光灯前面安装的是滤去紫外线的滤光片;
B. 黑光灯前面安装的滤光片仅让黑光通过;
C. 黑光灯一点燃就可以检验工件;
D. 必须在距黑光灯380mm处检验工件。

关于紫外光,正确的是:

A. 只要是紫外光就可以用于荧光磁粉检验
B. 黑光的峰值波长是365nm;
C. 波长320~400um的紫外光称为黑光;
D. 波长100~280nm的紫外光可用于杀菌消毒。