中药的药性不包括()
A.性味
B.归经
C.升降浮沉
D.来源
E.毒性
参考答案:D
—When is Jack going to finish writing that program?
—I don't know ______ day in and day out.[ ]
A. He has been working
B. He has worked
C. He had been working
D. He was working
在色谱分析中,为了缩短分析周期,加快操作速度,需要()柱温