题目内容

通常实验用高压氢气瓶的颜色是（）。

A. 天兰
B. 黑色
C. 深绿

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A. took effective measures
B. did not take any measure
C. asked the private sector
D. refused to take strong government actio

A. 20%
B. 15%
C. 10%
D. 5%