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恒温(1100℃)恒容密闭容器中发生反应：Na 2 SO 4 (s)＋4H 2 (g)→Na 2 S(s)＋4H 2 O(g)。下列说法正确的是( )A.
该反应的平衡常数表达式 K ＝ c (H 2 O)/ c (H 2 )
B.
若容器内气体的密度或压强保持不变，均说明该反应已达到平衡状态
C.
若Na 2 SO 4 足量，改变起始充入H 2 的浓度，达平衡时H 2 的转化率不变
D.
若初始时投入2.84gNa 2 SO 4 与一定量H 2 ，反应达平衡时容器内固体共有2.264g，则Na 2 SO 4 的转化率为45%
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【单选题】Our family makes it a________to turn off the television at mealtime and try to speak as little as p ossible. [ ]
A.
privilege
B.
pressure
C.
procedure
D.
principle
【简答题】Television is harmful to American polities because it makes the issues and electorate ______.
【单选题】People have criticized reality television because ______.
A.
it often makes fun with someone
B.
the name is inaccurate
C.
it uses special locations
D.
it shows reality
【单选题】Television makes us better ______than ever before.
A.
inform
B.
informing
C.
informed
D.
to be informed
【简答题】从自然属性来看最小的语音单位是( )。
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