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【单选题】
对于工业上用得红外线气体分析仪，下面说法中正确的是（ ）。A.
参比气室内装被分析气体
B.
参比气室中的气体不吸收红外线
C.
红外探测器工作在大气窗口之外
D.
测量气室内装N2
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【简答题】管理者的职能包括
【单选题】Listen to Track 6.
A.
To suggest that United States citizens have not changed much over \r\ntime
B.
To encourage the class to find more information about this time \r\nperiod
C.
To explain why Emerson’s essay has lost some relevance
D.
To provide background for the concept he is explaining\r\n \r\n
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