试题与答案

食管有哪三个狭窄?

题型:问答题 简答题

题目:

食管有哪三个狭窄?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C

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题型:填空题

700℃时,向容积为2L的密闭容器中充入一定量的CO和H2O,发生反应:CO(g)+H2O(g) CO2+H2(g)反应过程中测定的部分数据见下表(表中t1>t2):

反应时间/minn(CO)/moln(H2O)/ mol
01.200.60
t10.80 
t2 0.20
依据题意回答下列问题:

(1)反应在t1min内的平均速率为v(H2)=           mol·L-1·min-1

(2)保持其他条件不变,起始时向容器中充入0.60molCO和1.20 molH2O,到达平衡时,n(CO2)=           mol。

(3)保持其他条件不变,向平衡体系中再通入0.20molH2O,与原平衡相比,达到新平衡时CO转化率    (填“增大”或“减小”或“不变” 下同),H2O的体积分数      

(4)温度升至800℃,该反应平衡常数为0.64,则正反应为     反应(填“放热”或“吸热”)。

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题型:填空题

在下列各句的空白处填入一个最恰当的单词,使句子意思完整,语法正确。

1.—_______ gloves are these?

   —They are Mary's.

2.  In many countries people _______ hands when they meet for the first time.

3.  Miss Green k________ her daughter and said good night to her.

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6.  Japanese and Koreans _   __   _ when they meet for the first time.

7.  The teacher and students _ ____    each other at the beginning of every class.

8.  Eating dumplings on the eve of the Spring Festival is a Chinese_______.

9.  Many people are lying on the beach.  They look very _  _____.

10.       __     is a country that is famous for making watches.

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