椎管穿刺不经过
A．黄韧带
B．以上均错误
C．后纵韧带
D．棘间韧带
E．棘上韧带
参考答案：C
_____ to reach them on the phone, we sent an email instead. [ ]
A. Fail
B. Failed
C. To fail
D. Having failed
既助消化，又抑制催乳素分泌的药是
A．谷芽
B．麦芽
C．山楂
D．神曲
E．鸡内金
