相关考题
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单项选择题
The air is （）(有毒的).
A.humid
B.damp
C.toxic
D.mould -
单项选择题
Close all fire doors and use the （）（干粉灭火器）.
A. dry powder extinguisher
B. foam extinguisher
C. CO2 extinguisher
D. portable extinguisher -
单项选择题
The signals that will be used for emergency should be clearly （）（列出）.
A. put out
B. set out
C. set on
D. put on
