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【简答题】
(translate)Establishing business relations is the first step in transaction in foreign trade. If a new firm, or rather a certain corporation of ours, wishes to open up a market to sell something to or buy something from firms in foreign countries, the persons in charge must first of all find out whom they are going to deal with . We should not only do everything possible to consolidate old customers but also seek new ones to enlarge our business.
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皮皮学刷刷变学霸
举一反三
【单选题】配制:pH=7的缓冲溶液,应选择的缓冲对是:
A.
HAc－NaAc（pKa＝4.76）
B.
NaH2PO4－Na2HPO4（pKa＝7.21）
C.
NH3－NH4Cl（pKa＝9.24）
D.
Na2HPO4－Na3PO4（pKa＝12.7）
【单选题】欲配制pH=7的缓冲溶液应该选择的缓冲对是（）。
A.
NH 3 -NH 4 Cl(K b =1.8×10 -5 )
B.
NaHCO 3 -Na 2 CO 3 (Ka 2 =5.6×10 -11 )
C.
HAc-NaAc(K a =1.8×10 -5 )
D.
Na 2 HPO4-NaH 2 PO 4 (Ka 2 =6.3×10 -8 )
【简答题】任何真分数的倒数都是假分数．______．（判断对错）
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