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【單選題】
在一定溫度下，向體積為a L密閉容器中加入1 molX氣體和2 molY氣體，發(fā)生如下反應(yīng)：X（g） + 2Y(g) == 2Z(g)，此反應(yīng)達(dá)到平衡狀態(tài)的標(biāo)志是
A.
容器內(nèi)混合氣體的密度不隨時(shí)間變化
B.
容器內(nèi)各物質(zhì)的濃度不隨時(shí)間變化
C.
容器內(nèi)X、Y、Z的濃度之比為1∶2∶2
D.
單位時(shí)間消耗0.1molX同時(shí)生成0.2 mol Z
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舉報(bào)參考答案：
舉一反三
【單選題】When did Tom write to his mother last time?
A.
Last month.
B.
Last week.
C.
Yesterday.
【單選題】Mary has _________ 18-year-old daughter who has ________ gift for singing.
A.
a; a
B.
an; the
C.
an; a
D.
the; a
22 . The father as well as his three children _____ skatin g every winter.
22 . The father as well as his three children _____ skatin g every winter.
【單選題】She took her son, ran out of the house, _________ him in the car and drove quickly to the nearest doctor’s office.
A.
put
B.
to put
C.
putting
D.
having put
【單選題】On hearing the _________ voice, the little girl became_________.
A.
terrifying; terrifying
B.
terrifying; terrified
C.
terrified; terrified
D.
terrified; terrifying
相關(guān)題目：
【單選題】When did Tom write to his mother last time?
A.
Last month.
B.
Last week.
C.
Yesterday.
【單選題】Mary has _________ 18-year-old daughter who has ________ gift for singing.
A.
a; a
B.
an; the
C.
an; a
D.
the; a
22 . The father as well as his three children _____ skatin g every winter.
22 . The father as well as his three children _____ skatin g every winter.
【單選題】She took her son, ran out of the house, _________ him in the car and drove quickly to the nearest doctor’s office.
A.
put
B.
to put
C.
putting
D.
having put
【單選題】On hearing the _________ voice, the little girl became_________.
A.
terrifying; terrifying
B.
terrifying; terrified
C.
terrified; terrified
D.
terrified; terrifying
參考解析：
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