如果表观密度两次试验结果的算术平均值之差大于（）kg/m³.应重新试验。
A、20
B、10
C、30
D、15
参考答案：A
As soon as the man walked into the room ~
he ______ his heavy coat and sat down.
A．took away
B．took down
C．took off
D．took up
真人养脏汤中配伍诃子的用意是（）
A.涩肠止泻
B.下气消胀
C.下气消痰
D.清肺利咽
E.敛肺止咳
