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【简答题】
(1)前三周期元素中第一电离能最小的是____（填元素符号），其基态原子的电子排布式为________。第二周期非金属元素形成的氢化物中化学键极性最大的是___________（填分子式），该物质在CCl 4 中的溶解度比在水中的溶解度____（填“大”或“小”）。 (2)物质形成分子间氢键和分子内氢键对物质性质的影响有显著差异。根据下表数据，形成分子叫氢键的物质是____（填物质字母代号）。 (3)晶格能的大小：MgO_________NaCl，键能的大小：HBr____HI(填“>”、“=”或“(4)下列物质的熔点高低顺序，正确的是____。 A．金刚石>晶体硅>二氧化硅>碳化硅 B．Cl 4 >CBr 4 >CCl 4 >CH 4 C．SiF 4 >NaF>NaCl>NaBr
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【单选题】I would have paid _____ for the dress if the sales girl had insisted, because I really wanted it. [ ]
A.
as much twice
B.
twice as much
C.
twice more than
D.
more than twice
【单选题】Ashley bought a new pair of jeans. When she walked out of the store, she thought, “I got such a great deal; I would have paid $40 more for these jeans!” This best represents the concept of:
A.
. consumer surplus.
B.
. producer surplus.
C.
. total surplus.
D.
. equilibrium.
【单选题】— Do you regret spending 500 dollars on the overcoat? — No, I would have paid _____ if the shop owner had insisted. [ ]
A.
twice as much
B.
twice as many
C.
much as twice
D.
many as twice
【单选题】_________ 科威特宣布独立时,伊拉克拒不承认,并陈兵边界,企图武力占领科威特,只是因遭到英国和其它阿拉伯国家的反对而未能如愿。
A.
1951年
B.
1961年
C.
1971年
D.
1981年
【单选题】I would have paid ________ for my car if the salesman had insisted, because I really wanted it.
A.
much twice
B.
twice as much
C.
times two
D.
as much twice
【单选题】I would have paid _____ for my car if the salesman had insisted, because I really wanted it.
A.
as much twice
B.
much twice
C.
twice as much
D.
two times
【简答题】数控机床上以某一进给速度加工圆弧时，当伺服系统两轴的增益相同时，加工圆弧的半径愈大，则轮廓误差______。
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