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【单选题】
纳米技术是正在崛起的新科技，它研究的粒子直径在l～100nm之间。在此范围内物质的性质发生很大变化。例如Cu的直径加工成几个纳米时，会在空气中剧烈燃烧。纳米TiO 2 是理想的光催化剂，光照时在常温下可将汽车尾气中氮、硫的氧化物氧化成相应的酸，它还可以将废水中的有害物质快速氧化成CO 2 和 H 2 O、作抗菌材料等。以下有关说法中正确的是 [ ]A.
纳米铜比纳米铁金属活动性更强
B.
纳米铜在反应中可能作氧化剂
C.
纳米TiO 2 在不同溶剂中均形成了胶体
D.
纳米TiO 2 有很强的氧化性
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举一反三
【单选题】The Total Base Number (TBN) value of diesel engine lube oil refers to its ability to .
A.
resist changes in viscosity with changes in temperature
B.
resist emulsification
C.
neutralize acids
D.
resist oxidation at high temperatures
【单选题】患者，女，26岁，已婚。月经周期正常，经期延长，可达10～12天，量多，于月经第5天取子宫内膜检查，仍能见到呈分泌反应的内膜，首先应考虑的诊断是（）
A.
子宫内膜脱落不全
B.
黄体功能不足型功血
C.
无排卵型功血
D.
子宫内膜炎性出血
E.
甲状腺功能亢进
【简答题】Total shareholder return is a measure which combines the increase in share price and dividends paid and can be calculated as:
【单选题】A stock had a price at the beginning of the year of $100 and was selling for $108 at the end of the year. If the total shareholder rate of return was 10%, the cash dividend per share must have been ( ...
A.
$8
B.
$2
C.
$10
D.
$0
【单选题】A stock had a price at the beginning of the year of $100 and was selling for $108 at the end of the year. If the total shareholder rate of return was 10%, the cash dividend per share must have been ( ...
A.
$8
B.
$2
C.
$10
D.
$50
【单选题】Building this road will ______ the construction of ten bridges, and then the total cost reaches million US dollars.
A.
evolve
B.
involve
C.
revolve
D.
devolve
【简答题】 培训培训者(TTT)是指( )。
【简答题】Le mystère est total.
C'est un mystère .
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