关于吗啡镇痛作用的叙述,错误的是:
A.有明显镇静作用
B.镇痛作用强大
C.对急性锐痛的镇痛效力显著
D.镇痛同时不影响意识
E.对慢性钝痛的镇痛效力差
参考答案:E
.—Steve come back because the window is open.
—Yes.but he _______left it open last night.
A.must have;might have
B.might have;can’t have
C.can have;should have
D.might;must have