Today I have ___ things to do.
A.a great many of
B.a great many
C.a great deal of
D.much
答案:B
天疱疮的病机:
A.气血阴阳失和,脉络瘀阻B.脾虚湿盛,湿热蕴蒸,水湿积聚C.血分蕴热,湿热瘀阻D.外感风热,闭塞腠理E.湿热蕴结肌肤
离心式压缩机的级效率包括()。
A、单变效率;
B、传动效率;
C、多变效率;
D、绝热效率。