在pH8.6的巴比妥缓冲液中,血浆蛋白质在醋酸纤维素薄膜电泳中可分成的条带数是()。
A.1
B.2
C.3
D.4
E.5
参考答案:E
It matters little _______ a man dies, but ______ matters much is ________ he lives.
A.how; what; how
B.how; it; how
C.why; it; why
D.that; what; that
职业健康体检每年几次?