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【简答题】
阅读短文判断正“T”误“F”。 The City of the Future The future is coming! All over the world there are new ideas for new places to live and work in. Some of them will be in the sea! They will be very big, and lots of people will live and work in them. The Americans are planning to build a town called Atlantis City. It will be in the sea, about five miles away from the land. But the most exciting idea comes from Japan. It is called Acropolis. Acropolis will be a huge sea city, with parks, schools, a hospital and an airport…and it will move! It will travel slowly around the world. There are just two problems. Acropolis will cost a lot of money to make. And for people who get seasick, it won't be much fun! (     )1. Sea cities will be holiday towns. (     )2. They will be very big. (     )3. There are already two sea cities. (     )4. Atlantis City will be near America. (     )5. It will be five miles long. (     )6. Aeropolis is another American sea city. (     )7. 'Huge' means 'very small'. (     )8. Aeropolis will not stay in the same place. (     )9. Aeroplanes will land on Acropolis.
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【单选题】用K2Cr2O7作基准物,标定Na2S2O3溶液时,用Na2S2O3溶液滴定前,最好用水稀释,其目的是( )
A.
只是为了降低酸度,减少 I - 被空气氧化
B.
只是为了降低 Cr3+ 浓度,便于终点观察
C.
为了 K2Cr2O7 与 I- 的反应定量完成
D.
一是降低酸度,减少 I- 被空气氧化;二是为了降低 Cr3+ 浓度,便于终点观察
【简答题】用K2Cr2O7作基准物标定Na2S2O3溶液时,为什么要加入过量的KI和HCl溶液?为什么放置一定时间后才加水稀释?如果:(1)加KI溶液而不加HCl溶液;(2)加酸后不放置暗处;(3)不放置或稍放置一定时间即加水稀释,会产生什么影响?
【单选题】Which of the following expressions is in the product-of sums form?
A.
(A + B)(C + D)
B.
AB(CD)
C.
(AB)(CD)
D.
AB + CD
【单选题】Which of the following expressions is in the sum-of-products form?
A.
AB(CD)
B.
AB + CD
C.
(A + B)(C + D)
D.
(AB)(CD)
【单选题】标定 Na 2 S 2 O 3 溶液时,不直接用 K 2 Cr 2 O 7 滴定 Na 2 S 2 O 3 溶液的主要原因是( )
A.
反应没有确定的计量关系
B.
没有合适的指示剂
C.
反应速度慢
D.
K 2 Cr 2 O 7 氧化能力不足
【多选题】Choose expressions which have same meaning with "sometimes"
A.
on time
B.
from time to time
C.
at times
D.
in time
【单选题】Which of the following expressions results in an error?
A.
float(‘10’)
B.
int(‘10’)
C.
float(’10.8’)
D.
int(’10.8’)
【单选题】K 2 Cr 2 O 7 作基准物,标定 Na 2 S 2 O 3 溶液时,用 Na 2 S 2 O 3 溶液滴定前,最好用水稀释,其目的是 ( )
A.
只是为了降低酸度,减少 I - 被空气氧化
B.
只是为了降低 Cr 3+ 浓度,便于终点观察
C.
为了 K 2 Cr 2 O 7 与 I - 的反应定量完成
D.
一是降低酸度,减少 I - 被空气氧化;二是为了降低 Cr 3+ 浓度,便于终点观察
【简答题】吊车梁安装测量的准备工作有哪些?
【简答题】以KIO 3 标定Na 2 S 2 O 3 溶液时,称取基准物质KIO 3 0.3567g溶于水,配制成100.0mL溶液后分取25.00mL,加入H 2 SO 4 及KI溶液,用Na 2 S 2 O 3 溶液滴定至终点时,用去24.98mL。求Na 2 S 2 O 3 溶液的浓度。[M(KIO 3 )=214.0g·mol -1 ]
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