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【单选题】
水蒸气蒸馏不适用于以下哪个体系的分离( )。A.
反应混合物中含有大量树脂状杂质或不挥发性杂质。
B.
某些有机物在达到沸点时容易被破坏,采用水蒸气蒸馏可在100°C以下蒸出。
C.
从固体多的反应混合物中分离被吸附的液体产物。
D.
回收溶剂或者浓缩溶液。
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皮皮学刷刷变学霸
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【简答题】凸轮是一个具有 的构件,是 件,气门是 件。
【判断题】Set a minimum price you would pay for the item in your mind before you begin to bargain.
A.
正确
B.
错误
【单选题】A minimum wage set above the equilibrium wage rate is a price
A.
ceiling that results in a shortage of low-skilled labor.
B.
ceiling that results in a surplus of low-skilled labor.
C.
floor that results in a shortage of low-skilled labor.
D.
floor that results in a surplus of low-skilled labor.
【单选题】A legal minimum price is set which is below the equilibrium price. What will be the impact of this?
A.
Excess of demand over supply
B.
Excess of supply over demand
C.
Nothing
D.
i dont know
【单选题】A legal minimum price is set which is below the equilibrium price. What will be the impact of this?
A.
Excess of demand over supply
B.
Excess of supply over demand
C.
Excess of demand over supply
D.
Nothing
【单选题】A legal minimum price is set which is below the equilibrium price. What will be the impact of this?
A.
Excess of demand over supply
B.
Excess of supply over demand
C.
An increase in price
D.
Nothing
【单选题】A legal minimum price is set which is above the equilibrium price. What will be the impact of this?
A.
Excess of demand over supply
B.
Excess of supply over demand
C.
Black marketeers may seek to operate
D.
Nothing
【单选题】A legal minimum price is set which is below the equilibrium price. What will be the impact of this?
A.
Excess of demand over supply
B.
Excess of supply over demand
C.
Nothing
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