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【单选题】
下列关于焰色反应的说法正确的是( )A.
用洁净铂丝蘸取溶液进行焰色反应，火焰呈黄色，则原溶液中有 Na + ，无 K +
B.
用稀硫酸洗涤并灼烧铂丝后，再进行焰色反应
C.
焰色反应是物理变化
D.
焰色反应是某些金属单质具有的性质
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举一反三
【单选题】Suppose a country abandons a no-trade policy in favor of a free-trade policy. If, as a result, the domestic price of pistachios decreases to equal the world price of pistachios, then
A.
that country becomes an importer of pistachios.
B.
that country has a comparative advantage in producing pistachios.
C.
at the world price, the quantity of pistachios supplied in that country exceeds the quantity of pistachios demanded in that country.
D.
All of the above are correct.
【简答题】Suppose m is integer,if a=(4,m), b=(-2m,4),OA→=a+2b,OB→=2a-b, |OA→|=|OB→|, then the area of the △OAB is ___.
【简答题】音的物理属性,即音的四大要素是什么?— ,—,—,—。
【单选题】31) Suppose policy makers decide to reduce taxes. This fiscal policy action will cause which of the following to occur?
A.
The LM curve shifts and the economy moves along the IS curve.
B.
Output will change causing a change in money demand and a shift of the LM curve.
C.
Both the IS and LM curves shift.
D.
Neither the IS nor the LM curve shifts.
E.
The IS curve shifts and the economy moves along the LM curve.
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