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【单选题】
二苯碳酰二肼分光光度法测定水中总铬,是在酸性或碱性条件下,用高锰酸钾将 ,再用二苯碳酰二肼显色测定。A.
二价铬氧化为三价铬
B.
二价铬氧化为六价铬
C.
三价铬氧化为六价铬
D.
六价铬还原为六价铬
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】如果一个元素外层套用了CSS样式,内层套用了HTML样式,在起作用的_____。
A.
CSS样式
B.
HTML样式
C.
两种样式的混合效果
D.
冲突,不能同时套用
【简答题】“Voluntary”Export Quotas(西南财大2002研，厦大2002研，东北财大2004研)
【单选题】A voluntary export agreement
A.
Typically applies only to the world's most important exporting nation(s)
B.
Typically applies only to the world's least important exporting nation (s)
C.
Is always more restrictive on trade than a tariff or import quota
D.
All of the above
【单选题】"Voluntary export restraints" involve
A.
a sharing of benefits by both countries equally.
B.
the transfer of revenues to the importing consumers.
C.
the exercise of monopoly power by the exporting country.
D.
the exercise of monopoly power by the importing country.
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