【单选题】•Read the article below about job satisfaction. •Choose the correct word to fill each gap from A, B, C or D on the opposite page. •For each question (21-30), mark one letter (A, B, C or D) on your Ans...
【单选题】8 下列关于热化学反应的描述正确的是
A.
CO 的燃烧热是 283.0 kJ/mol ,则 2CO 2 (g) 2CO(g)+O 2 (g) Δ H =+283.0 kJ/mol
B.
HCl 和 NaOH 反应的中和热 Δ H =-57.3 kJ/mol ,则 H 2 SO 4 和 Ba(OH) 2 的反应热 Δ H =2×(-57.3) kJ/mol
C.
等物质的量的硫蒸气和硫固体分别完全燃烧,后者放出热量少
D.
已知: H - H 键的键能为 a kJ/mol , Cl - Cl 键的键能为 b kJ/mol , H - Cl 键的键能为 c kJ/mol ,则生成 1 mol HCl 放出的能量为 ( a + b -2 c )/2 kJ
【单选题】•Read the information below about Maureen Dowd. •Choose the correct word to fill in each gap, from A, B or C below. •For each question 29-40, mark one letter (A, B or C) an your Answer Sheet. This wor...
【判断题】无产阶级的解放与有产阶级的解放之间有不可调和的矛盾。( )
【单选题】We read “2008” _____ .
A.
two thousand and eight
B.
two thousands and eight
C.
two thousands and eighty