液体
血浆
乳汁
唾液
胆汁
胰液
胃液
pH范围
7.35﹣7.45
6.6﹣7.6
6.6﹣7.1
7.1﹣7.3
7.5﹣8.0
0.9﹣1.5
A:血浆
B:乳汁
C:唾液
D:胃液
A.
B.
C.
D.
E.
More than two weeks _______ since the foreign friends came here.