广泛应用在需要高发光效率、高品质白光及精确控光的场合尤其适宜_爱下问搜题

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问题单项选择题

广泛应用在需要高发光效率、高品质白光及精确控光的场合尤其适宜的照明光源为（）

A.高流明单端荧光灯

B.高压钠灯

C.高压汞灯

D.金属卤化物灯

答案

参考答案：D

选择题

—Which skirt do you prefer, Lucy?

— _______ I'm concerned, the purple one is better. [ ]

A. As far as

B. As long as

C. As soon as

D. As much as

选择题

大多数有机物具有的性质是[ ]

①容易燃烧

②受热易分解

③熔沸点较低

④副反应较多

⑤反应较慢

⑥易溶于极性较小的溶剂

A.①②⑥

B.③④⑤

C.③④⑥

D.①②③④⑤⑥