试题与答案

可逆反应:N2 (g)+3H2 (g)2NH3(g)正反应放热,下列说法错误的是

题型:选择题

题目:

可逆反应:N2 (g)+3H2 (g)2NH3(g)正反应放热,下列说法错误的是

A.使用催化剂可加快速率,提高生产效率

B.N2不可能完全转化为NH3

C.增大H2浓度可提高N2转化率

D.达平衡时,N2与NH3浓度比为1:2

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:围绝经期是指从接近绝经出现与绝经有关的内分泌学、生物学和临床特征起至绝经后1年内的期间,即绝经过渡期至绝经后1年有些人并不出现明显症状。

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第一节单词拼写(共10小题;满分10分)

根据下列句子及所给首字母,写出空缺处各单词的正确形式。

81. There has been some progress in saving e_______ wildlife in China.

82. If their habitat is threatened or they cannot find enough food, their numbers may d_______.

83. In a way it was a r_______ to know that the children all arrived home safe.

84. He was so wild with joy that he could hardly c_______ his excitement.

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86. What must be done if wildlife protection is to s_______.

87. The building is regularly i_______ by the fire-safety officer.

88. His d_______ to the cause of peace is well-known.

89. Sometimes these musicians may play to p_______ in the street or subway so that they can earn some extra money for themselves.

90. They were so popular that their fans formed clubs in order to get more f_______ with them.

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