栓剂在常温下为()
A.固体
B.液体
C.半固体
D.气体
E.无定形
参考答案:A
解析:胺碘酮长期应用可见角膜褐色微粒沉着,不影响视力,停药后微粒可逐渐消失。
I should apologize to you for failing to visit you last week, but I've been very busy_____ the past few months.
A.since
B.before
C.among
D.over
錾子要用工具钢(TA7)锻成,且经淬火和回火热处理,保证錾子切削部分有适当的()