积滞的主要病证是
A．外感六淫
B．乳食内伤
C．饮食不洁
D．脾胃素虚
E．肝胃不和
参考答案：B,D
Would you tell me what subject you were good _____ school?
A．at at
B．in in
C．for for
D．with with
填料压盖太紧，水泵会出现什么情况（）
A、负荷太大
B、启动不起来
C、负荷太小
