血CEA升高为()
A.胃泌素瘤
B.胃肠癌
C.肝癌
D.胰腺癌
E.胃肠淋巴瘤
参考答案:B
--- _______ do you play computer?
--- Once a week, only on Saturday evening.
A.How many
B.How much
C.How often
D.How long
决定主板主要性能的部件是()。
A.CPU插座
B.内存插槽
C.芯片组型号
D.BIOS程序版本