产后自汗盗汗的主要机理_______。
参考答案:产后气虚,卫阳不固或阴虚内热,浮阳不敛,迫汗外溢所致
I'm waiting for my friend Jenny. _______, I'll go shopping alone.
[ ]
A. If she doesn't come
B. If she won't come
C. If she will come
D. If she is coming
不能提高查询性能的措施是: (56) 。
A.根据查询条件建立索引
B.建立相关视图
C. 尽量使用不相关子查询
D.建立查询表的聚簇索引