水泥的强度等级是按它的（）进行分级的。
A.质量
B.细度
C.长度
D.粘度
参考答案：B
Many people like to travel by air, _____ Jim's family think that traveling by train is the best. [ ]
A. or
B. and
C. so
D. but
饮食停滞型胃炎治疗宜
A．清肝和胃，泄热止痛B．散寒行气，温中止痛C．消食导滞，和胃止痛D．健脾益气，温中和胃E．健脾解郁，温中止痛
