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【单选题】
下列关于物质的组成、结构、性质及变化规律的总结，正确的是（ ）A.
H 2 O、HCl、NaNO 3 均由不同种元素组成，属于混合物
B.
Fe、Fe 2+ 、Fe 3+ 三种微粒的质子数相同，化学性质也相同
C.
浓H 2 SO 4 、NaOH都具有吸水性，故它们都能用来干燥二氧化碳气体
D.
NH 4 NO 3 、（NH 4 ） 2 SO 4 、NH 4 Cl殾能与NaOH反应，放出NH 3
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举一反三
【单选题】Which of the following statements about standby letters of credit is true?______.
A.
They can serve as a guarantee to a buyer against a seller defaulting.
B.
They are contrary to the general rule that letters of credit may only be used for the actual movement of goods.
C.
They are unlike a tender (or other) bond in their legal standing and method of operation.
D.
They are unlike a tender bond with its fixed expiry date.
【简答题】武术教学中常用的练习方法有哪几种?
【简答题】As a rule, the buyer ought to bear the charges _____________ packing.
【简答题】已知集合A={x|-1＜x≤4}，集合B={ x|2＜x≤5}，则A∩B=______．
【单选题】As a general rule,the export goods are always inspected by the ( ) before shipment.
A.
shipper
B.
buyer
C.
agent
D.
distributor
【简答题】已知全集U={1，2，3，4，5}，集合A={x|x 2 -3x+2=0}，B={x|x=2a，a∈A}，则集合C U （A∪B）=______．
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