过滤式自救器是用于防止（）中毒的呼吸保护装置。
A.CO
B.CO2
C.瓦斯
参考答案：A
The new stadium being built for the next Asian Games will be ______ the present one.
A．as three times big as
B．three times as big as
C．as big as three times
D．as big three times as
分期收款销售商品时，应收的合同或协议价款与其公允价值之间的差额，应当在合同或协议期间内采用实际利率法进行摊销，冲减营业收入。( )
