借贷记账法以()为记账规则。
A.有借未必有贷,借贷不相等
B.有借必有贷,借贷不相等
C.有借未必有贷,借贷必相等
D.有借必有贷,借贷必相等
参考答案:D
The hospital ________ well, where many wounded ________ every day.[ ]
A.is operated; operation
B.operates; are operated on
C.operates; are operated
D.operates; operates on
试比较酶退浆,碱退浆,酸退浆的优缺点?