混凝土中掺入粉煤灰可以节约水泥,但不能改善混凝土的其他性能。
参考答案:错
---Why were you late for school today?
----It was ________ I help catch a thief on the bus.
A.since
B.as
C.for
D.because
企业采用计划成本核算原材料,平时收到原材料时应按实际成本借记“原材料”科目,领用或发出原材料时应按计划成本贷记“原材料”科目,期末再将发出材料和期末材料调整为实际成本。( )