RA累及髂关节时可出现（）
A.臀部疼痛
B.髂关节活动受限
C.髂关节肿胀不明显
D.下腰部疼痛
E.以上都是
参考答案：E
— What's wrong with you?
— I caught ______ bad cold and had to stay in ______ bed. [ ]
A. a; /
B. a; the
C. a; a
D. the; the
固体废物样品的水分测定，对于无机物样品于（）下干燥，恒重至±0.1g，测定水分含量。（）
A.600C
B.800C
C.1000C
D.1050C
