具有清湿热,泻火毒,退虚热作用的药物是()
A.栀子
B.石膏
C.黄柏
D.知母
E.黄连
参考答案:C
Look ! The boys _ on the playground.[ ]
A. is playing
B. are playing
C. play
D. played
(三)
逐条说明该电梯工程的施工程序和施工安全技术措施是否妥当如不妥,请改正。