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【单选题】
利用四氧化三钴纳米棒作催化剂的催化净化装置，可将汽车尾气中的CO在低温下转化为CO 2 ，过程如图所示．下列说法正确的是 [ ]A.
该净化装置能将有毒尾气全部吸收
B.
反应前后四氧化三钴质量改变
C.
该过程不能说明CO具有可燃性
D.
反应物和生成物均为氧化物
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举一反三
【简答题】进程的含义是什么?进程存在的标志是什么?
【简答题】向以上2张表中插入数据证明外键已经生效。
【单选题】—How much of the foreign expert’s speech have you understood? —Almost nothing. I wish I ________ harder at English.
A.
worked
B.
had worked
C.
would work
D.
were working
【单选题】I am very surprised that even an expert on foreign affairs can know the painting is forgery. () he can tell who painted it
A.
however
B.
Otherwise
C.
Nevertheless
D.
Moreover
【单选题】—How much of the foreign expert’s speech have you understood? —Next to nothing. I wish I _______ harder at English.
A.
worked
B.
had worked
C.
would work
D.
were working
【单选题】The foreign expert put forward a plan at yesterday’s meeting, _____ all the people present spoke highly of.
A.
that
B.
what
C.
which
D.
when
【单选题】—How much of the foreign expert's speech have you understood? —Next to nothing.I wish I ________ harder at English. [ ]
A.
had worked
B.
worked
C.
would work
D.
were working
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