气虚导致的便秘应当（）
A.泻热通腑
B.行气导滞
C.养血润肠
D.益气润肠
E.温肠通便
参考答案：D
There are over forty students in our class. [ ]
A. less than
B. more than
C. nearly
D. about
当在三位三通电磁阀上通（）电流时，为减压状态。
A、0
B、最大
C、—半
