血清白蛋白(pI为4.7)在下列哪种pH溶液中带正电荷
A.pH 4.0B.pH 5.0C.pH 6.0D.pH 7.0
参考答案:A
—Excuse me, where can I post this postcard?
—You may post it ______. [ ]
A. on your way to home
B. in your way to home
C. on the way home
D. on the way to home
离心泵使用机械密封时,若介质为轻油,则允许机封泄漏为(),若介质为重油时,则允许机封泄漏量为()。