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【单选题】
从经济效益和环境保护考虑，大量制取硝酸铜最宜采用的方法是A.
Cu + HNO 3 （浓）→ Cu(NO 3 ) 2
B.
Cu + HNO 3 （稀）→ Cu(NO 3 ) 2
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举一反三
【简答题】*Fill in the blanks. 1. The main part of a word is called the ____________. 2. A word part at the beginning of a word is a(n) ____________. 3. A word part at the end of a word is the ____________. 4. ...
【单选题】There are many ways used in communication. The printed word is just about the most important way we have【C1】______communicating with one another. Look around you at the【C2】______in school at the news-...
A.
by
B.
with
C.
of
D.
in
【单选题】From item 1 to 10 Choose the word or phrase that is most closely related to the given word or phrase a surprise
A.
known
B.
unknown
【简答题】在TCP/IP环境下,网络层有一组将IP地址转换为相应物理网络地址的协议,这组协议即为_______。
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