慢性阻塞性肺气肿见
A.苦寒B.香燥C.滋腻D.甘寒E.食疗
参考答案:B
I didn't know _____ they could pass the exam or not. [ ]
A. why
B. when
C. that
D. whether
若遇重大节日装设彩灯电流在50A以上时应采用()。
A、单相二线制供电;
B、三相四线制供电;
C、任意供电方式均可