下列有关CO2的说法,不正确的是[ ]
A.CO2可用作气体燃料
B.干冰可用于人工降雨
C.“碳酸水”显酸性
D.大气层中CO2过多会造成“温室效应”
答案:A
To ____ this happening again, John commanded that the source of all the water supplies ___ . [ ]
A. stop, was examined
B. keep, should be examined
C. prevent, examined
D. stop, be examined
复式汽车库的防火分区最大允许建筑面积按常规要求减少()
A.15%
B.20%
C.25%
D.35%