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【单选题】
This film_________ the scenes of my childhood.
A.
called up
B.
called on
C.
called out
D.
called for
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【单选题】关于卤族元素的化学性质下列叙述正确的是
A.
氢氟酸是强酸,所以具有强腐蚀性
B.
卤族的原子半径由大到小顺序为I>Br>Cl>F
C.
碘难溶于酒精,所以能用酒精从碘水中萃取碘
D.
因为碘易溶于酒精,所以能用酒精从碘水中萃取碘
E.
卤族元素的最高氧化物的水合物的酸性从氟到碘增强
【单选题】以下四种酸中,对泥砂岩腐蚀性最强的是()。
A.
盐酸
B.
乙酸
C.
氨基磺酸
D.
土酸
【简答题】He’s the most ___1___ businessmanin the world. Many ___2___ have been written about how he has dominatedthe revolution in personal ___3___ . But we know little about him asa person. Here’s a ___4___ ...
【单选题】以下描述塑料王的特性哪一项是不正确的?()
A.
塑料王的化学名称是四氟乙烯
B.
有很好的耐腐蚀性能,腐蚀性最强的”王水”,对它也无能为力
C.
由它制成的产品表面非常光滑
D.
既耐热又耐冷,在250℃高温至零下195℃低温范围内都可使用
【单选题】如图是稀酸对Fe-Cr合金随Cr含量变化的腐蚀性实验结果,下列有关说法正确的是
A.
稀硝酸对Fe-Cr合金的腐蚀性比稀硫酸和稀盐酸的弱
B.
稀硝酸和铁反应的化学方程式是Fe+6HNO 3 (稀)= Fe(NO 3 ) 3 + 3NO 2 ↑+ 3H 2 O
C.
Cr含量大于13%时,因为三种酸中硫酸的氢离子浓度最大,所以对Fe-Cr合金的腐蚀性最强
D.
随着Cr含量增加,稀硝酸对Fe-Cr合金的腐蚀性减弱
【单选题】图是一稀酸对Fe-Gr合金随Cr含量变化的腐蚀性实验结果,下列有关说法正确的是(  )
A.
稀硝酸对Fe-Cr合金的腐蚀性比稀硫酸和稀盐酸的弱
B.
稀硝酸和铁反应的化学方程式是:Fe+6HNO 3 (稀)═Fe(NO 3 ) 3 +3NO 2 ↑+3H 2 O
C.
Cr含量大于13%时,因为三种酸中硫酸的氢离子浓度最大,所以对Fe-Cr合金的腐蚀性最强
D.
随着Cr含量增加,稀硫酸对Fe-Cr合金的腐蚀性减弱
【简答题】Fill the blanks with the words and phrases you have heard. He’s the most 1 businessman in the world. Many 2 have been written about how he has dominated the revolution in personal 3 . But we know litt...
【单选题】以下腐蚀性最强的是()。
A.
二氧化氯
B.
氯气
C.
次氯酸盐
D.
过氧化氢
【单选题】When Bill Gates was in high school, he __________ .
A.
was always highly focused on writing software.
B.
attended different kinds of classes
C.
had many interests
D.
read about all kinds of things
【单选题】During the years when Bill Gates was a kid, the disaster people worried about most was ____________________.
A.
a hurricane
B.
a nuclear war
C.
an earthquake
D.
an epidemic
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