浮阀塔板的缺点？
参考答案：
阀片易卡住，锈住和粘住，故不自由开启造成事故。
A great number of students____________ said they were forced to practise the piano.
A．to question
B．to be questioned
C．questioned
D．questioning
既能消食健胃，又能回乳消胀的药物是
A．神曲B．山楂C．鸡内金D．莱菔子E．麦芽
