增感屏的增感性能一般用增感系数或（）表示。
参考答案：增感率
Mr. Black would rather __________than _________on Christmas eve because of the crazy spray snow fight everywhere.
A．stay at home, to go out
B．stay at home, go out
C．to stay at home, go out
D．to stay at home, to go out
下列税金不允许在计算企业所得税前扣除的是（）
A.消费税
B.增值税
C.营业税
D.关税
