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

问题:

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

考点:化学平衡的有关计算影响化学平衡的因素达到化学平衡的标志化学平衡常数
题型:选择题

第II卷(写作,共40分)

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.

85. Have you ever wanted to be part of a band as a famous singer or m_______?

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.

题型:选择题

数据库管理系统是用于管理数据的计算机软件。通过使用数据库管理系统,用户能方便地定义和操纵数据,维护数据的安全性和完整性,以及进行多用户下的并发控制和恢复数据库。

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在Intemet中,用户电子邮件地址的表示方式为()。

A.FTP://用户名、主机名

B.WWWW://用户名、主机名

C.HTTP://用户名、主机名

D.用户名@主机名

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施工现场应按地基承载力不少于65kPa的要求进行整平压实。

题型:选择题

()舞起源于美国黑人舞蹈。

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