标准券是由各种债权根据( )折合相加而成的,是一种虚拟的回购综合债券。
A.面值
B.市值
C.收益率
D.折算率
参考答案:D
— Did you help them clean their house?
— ______________.[ ]
A. Yes, I am
B. No, I don't
C. Yes, I did
据《建筑施工场界环境噪声排放标准》,建筑施工场界环境噪声排放限值为昼间(),夜间()
A.65dB;55dB
B.75dB;60dB
C.70dB;50dB
D.70dB;55dB