溴丙胺太林为（）.
A．季铵盐不易透过血脑屏障
B．外消旋体
C．含有内酯环
D．含有环氧基
E．含有氮杂卓环
参考答案：A
To his disappointment, the opinion he had stuck________out wrong.
A．to turn
B．to turning
C．to turned
D．to be turned
蜡封法测密度，封蜡的目的是防止水渗入土样孔隙中。
