离子交换层析的常用介质是()
A.聚丙烯酰胺
B.琼脂糖
C.琼脂糖-聚丙烯酰胺
D.葡聚糖
E.纤维素
参考答案:E
胃癌淋巴结转移常见部位为()
A.右锁骨上
B.左锁骨上
C.右颈部
D.左颈部
E.左颌下
We give you on the attached sheet full details regarding packing and markin9,which must be strictly__________.
A. observed
B. abide by
C. submitted
D. seen