雷尼替丁抑制胃酸分泌的机制是
A．阻断M1受体
B．阻断H1受体
C．阻断H2受体
D．促进PGE2合成
E．干扰胃壁细胞内质子泵的功能
参考答案：C
连续排污有何作用？
．What I like about Harvard is there’s the old classical look—there are parks and traditional buildings.
A．why
B．where
C．that
D．how
