下列哪种药物在胎盘中的浓度可高于母血浓度（）
A.地西泮
B.咪达唑仑
C.氯丙嗪
D.丙泊酚
E.芬太尼
参考答案：A
铣削封闭的内轮廓表面时，进刀方式应选择（）切入。
A．圆弧
B．法向
C．根据需要选择A或B
D．无正确答案
Tom asked my friend ______.
A．where was he from
B．that the earth is bigger than the moon
C．when did he come back
D．not to be so angry
