由于毛细管柱是不填充载体的空心柱,因此()。
A.分子扩散项为零
B.涡流扩散项为零
C.液相传质阻力为零
D.气相传质阻力为零
E.以上各项均不可能为零
参考答案:E
Rather than_______ on a crowded bus, he always prefers_______ a bicycle. [ ]
A. ride; fide
B. riding; ride
C. ride; to ride
D. to ride; riding
"虚则补之"与"以补开塞"有何异同?