外保温墙上安装空调室外机,固定三角架的膨胀螺栓必须是()。
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禁止在起吊高度的()倍半径内有其他作业和非作业人员在内。
A. 1
B. 1.2
C. 2
What is the main idea of this passage？
A. Gold prices are very volatile.
B. Gold prices may drop further.
C. Gold is a perfect inflation hedge.
D. Predicting gold prices is very difficult.
安全标志包括:禁止标志、警示标志、指令标志、提示标志、说明标志、环境信息标志、和()标志7种。
A. 局部
B. 外部
C. 内部
It can be inferred from Paragraph 1 that in 2012______.
A. gold was getting cheaper
B. gold was about to experience a downfall
C. the price of gold was climbing
D. the sale of gold was declining
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