中国古代建筑,从建筑等级上划分,可分为大式、中式、小式三个类型。( )
参考答案:错
下列说法正确的是( )
A.CO2的摩尔质量为44g
B.5.4mL4℃的H2O中有1.806×1022个分子
C.标准状况下,2.24L CCl4所含的原子数为0.5NA
D.50mL 1mol/L BaCl2溶液中,Ba2+和Cl-物质的量之和是0.1mol
—Why didn’t you tell him about the meeting?
—He rushed out of the room _____ I could say a word.
A.before
B.until
C.when
D.after