外墙内表面温度不应低于室中央气温（）
A.2~3℃
B.2~5℃
C.3℃
D.5℃
E.6℃
参考答案：E
What caused the accident and who was responsible for it ________ a mystery.[ ]
A. has remained
B. are remained
C. remains
D. remain
被公认为是行政学创始人的是（）
A.泰罗
B.法约尔
C.威尔逊
D.古德诺
