按Fanger的热舒适理论，影响热舒适的主要因素有（）个。
A.4
B.5
C.6
D.7
参考答案：C
It's very hot in the room. You'd better ____ your coat. [ ]
A. take off
B. put on
C. think about
D. try on
起重机严禁在架空输电线路下面工作，否则应停电作业。当不允许停电时，必须采取可靠的隔离防护措施后，方能进行吊运。（）
