荧光灯管的亮度约为（）。A．0.3×104cd/㎡ B．0.3×103cd/㎡ C．

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问题单项选择题

荧光灯管的亮度约为（）。

A．0.3×104cd/㎡

B．0.3×103cd/㎡

C．0.3×102cd/㎡

D．0.3×10cd/㎡

答案

参考答案：A

选择题

- What do we need to buy? - _______.

A．Two kilos of tomatoes and two packets of salts

B．Two kilos of tomatoes and two packet of salt

C．Two kiloes of tomatos and two packets of salt

D．Two kilos of tomatoes and two packets of salt

问答题简答题

水质标准是什么？其分类如何？