一个固体化合物的溶出速率通常不受以下哪一因素的影响()
A.固体表面积
B.介质pH值
C.固体粒度
D.pKa
参考答案:D
At first I guessed it was an airplane, but I soon changed my mind because it remained static instead of moving like a plane.()
A. stationary
B. statutory
C. stationery
D. statuesque
表达式a*(b+c)-d的后缀表达式是()。
A.abcd+-
B.abc+*d-
C.abc*+d-
D.-+*abcd