原式=3+1-3-1+4
=4．
_____ soldiers and doctors have been in Wenchuan to help the people there.
A．Thousand of
B．Two thousands
C．Thousands of
D．Many thousands of
因供货单位破产，企业预付账款已不符合其性质，所购货物也无望收回时，企业应借记“管理费用”，贷记“预付账款”科目。 ( )
