适用于采集不活泼气体采样（）
A.玻璃注射器采样
B.铝塑夹层袋采样
C.多孔板吸收管采样
D.活性炭固体吸附剂采样
E.无泵型气体采样器
参考答案：B
The two coal miners, ________in the mine for as long as three days, were eventually rescued and sent
to hospital immediately.[ ]
A. to trap
B. trapping
C. trapped
D. having trapped
角钢是按照腿的（）来表示规格的。
A．长度
B．厚度
C．重量
