叶轮和泵壳摩擦可造成深井泵运行时发生剧烈振动，这时应尽快更换_爱下问搜题

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问题判断题

叶轮和泵壳摩擦可造成深井泵运行时发生剧烈振动，这时应尽快更换橡胶轴承

答案

参考答案：错

选择题

— Is _____ mother a teacher?
— Yes, and Lucy and Lily are _____.

A. Lucy and Lily's, twin sisters
B. Lucy and Lily's, twin sister
C. Lucy's and Lily's, twin sisters
D. Lucy's and Lily's, twin sister

单项选择题

香附的功效是()

A．疏肝理气，调经止痛

B．理气散寒，燥湿化痰，消食

C．通阳散结，行气导滞

D．行气止痛，降逆调中

E．破气消积，化痰除痞