建筑安装工程费用定额一般包括（）。

A．直接费定额和间接费定额

B．直接费定额和措施费定额

C．措施费定额和间接费定额

D．直接费定额、措施费定额和间接费定额

How many liters of pure alcohol must be added to a 100-liter solution that is 20 percent alcohol in order to produce a solution that is 25 percent alcohol ？（）

A.A

B.B

C.C

D.D

E.E