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【单选题】
把过量小苏打与过氧化钠混合后加热,最后留下的固体物质为 ( )A.
NaOH 和Na 2 CO 3
B.
Na 2 CO 3
C.
Na 2 CO 3 和Na 2 O 2
D.
Na 2 O和Na 2 O 2 、Na 2 CO 3
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举一反三
【单选题】1952年教育部颁发实行的《幼儿园暂行教学纲要(草案)》规定的幼儿园教养活动项目有体育、计算,图画手工、音乐、语言和( )
A.
常识
B.
品德
C.
认识环境
D.
社会
【单选题】(练习12-2) What does the seller need to guarantee?
A.
Payment will be made as soon as an agreement is signed．
B.
Payment will be made when the contract is concluded．
C.
Payment will be made the moment goods are supplied．
D.
Payment will be made until a Letter of Credit is ordered．
【多选题】if you were the seller, what will you say to bargain with the buyer
A.
That's the best i can do
B.
That's the lowest price I can go
C.
I'm sorry. It's my last offer
D.
Is there anying I can do for you?
【简答题】Once there were two mice. They were friends. One mouse lived in the country; the other mouse lived in the city. After many years the Country mouse saw the City mouse; he said, 'Do come and see me at m...
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