Andeison entered the classroom, ____book in ___hand.
A.×, his
B.×, ×
C.a, ×
D.a, the
答案:B
血清甲胎蛋白(AFP)升高的是
A.肾结石B.肾结核C.肾肿瘤D.肾下垂E.肾水肿
利润中心的类型有(1)();(2)()。