在下列各种定额中，以工序为研究对象的是（ ）。
A．概算定额
B．压施工定额
C．预算定额
D．投资估算指标
参考答案：B
It was said that they _____ for twenty-five years.
A．had got married
B．had married
C．married
D．had been married
软胶囊的胶皮处方由（）组成.
A、明胶
B、甘油
C、水
D、乙醇
