醋酸可的松中存在的特殊杂质为
A.重金属
B.氯化物
C.其他甾体
D.砷盐
E.不挥发物
参考答案:C
In Hangzhou,Mr.Black was so struck ________ the beauty of nature that he stayed ________ another night.
A.at;on
B.with;at
C.for;in
D.by;for
装置紧急停工的步骤?