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【单选题】
一定温度条件下，在固定体积的密闭容器中发生反应A （ s ） + 2B （ g ） C （ g ） + D （ g ） ，能说明该反应达到平衡状态的标志是A.
平衡体系的总压不变
B.
平衡混合气体的平均相对分子质量不变
C.
C 和D的物质的量相等
D.
平衡混合气体的总物质的量不变
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举一反三
【单选题】We trust your initial order will be placed with us .
A.
without delayed
B.
without delaying
C.
without delays
D.
without delay
【单选题】将He has returned the book.改为否定句。
A.
He hasn't returned the book.
B.
He has returned not the book.
【单选题】Only when _______ home_____ that he had left his bag in the taxi he had taken.
A.
he returned; did he realize
B.
did he return; did he realize
C.
he returned; he realized
D.
did he return; he realized
【简答题】连词成句。 returned, he, me, to, kite, the (.) ________________________________________________
【单选题】---Has he returned the books you lent him? ---He returned one book last week and promised to bring _____________ on Wednesday. [ ]
A.
others
B.
other
C.
another
D.
the others
【单选题】When he was sixty years old, he _____ his hometown.
A.
returned
B.
returned back
C.
returned to
D.
went back
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