下列哪种蛋白质在pH=5的溶液中带负电荷()。
A.pI=4.5的蛋白质
B.pI=7.4的蛋白质
C.pI=7的蛋白
D.pI=6.5的蛋白质
参考答案:A
-I will allow you to use my computer if you can finish your homework before 4 o'clock today.
-Is that a_______? I'm sure I can make it.
A.chance
B.promise
C.trick
D.treat
齿轮粗铣后,若测得公法线长度比图样要求2mm,则工作台应上升()mm进行精铣
A.2
B.2.92
C.2.74
D.4