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【单选题】
对于氧化还原反应: ,当得失电子数 n 1 =n 2 =1 时,要使化学计量点时反应的完全程度达到 99.9% 以上, lgK ′ 至少应为A.
8
B.
7
C.
6
D.
5
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【简答题】简述材料的耐久性与其应用价值间的关系，能否认为材料的耐久性越高越好？
【单选题】When studying at school, it is essential to _______________ between what information is important and what information is not.
A.
motivate
B.
discriminate
C.
accurate
D.
rationalize
【单选题】What information is given about Moana?
A.
It is somewhat expensive.
B.
The food portions are large.
C.
It is often crowded.
D.
The sandwiches are recommended.
【单选题】I wanted two seats Madame Gurie for Friday night, so I rang the cinema to seeif I could book two tickets.
A.
of
B.
about
C.
to
D.
for
【单选题】等产量曲线是指这条曲线上的各点代表
A.
为生产同等产量投入要素的各种组合比例是不能变化的
B.
为生产同等产量投入要素的价格是不变的
C.
不管投入各种要素如何,产量总是相等的
D.
投入要素的各种组合所能生产的产量都是相等的
【单选题】What information is given in the article?
A.
Capture the Rain is Mike Johnson's debut work.
B.
The barrels collect water as it drains from the roof.
C.
A family's one-year savings is greater than the cost of the barrels.
D.
The author is unconvinced of the book's value.
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