患者,男,59岁。久咳不止,咳声低微,少气乏力,痰少而干,痰中有血丝,用药应首选的药物是()。
A.人参
B.西洋参
C.黄芪
D.甘草
E.山药
参考答案:B
I can't sleep, because the English teacher is _____________ me now.[ ]
A. look
B. looking
C. looking at
D. looks
捣固车拨道滚轮要求每工作()应对其进行加注润滑油脂。
A、50h
B、100h
C、200h
D、300h