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【单选题】
煮沸消毒时,为提高沸点,水中加入碳酸氢钠的浓度为A.
1％
B.
5％
C.
3％
D.
O.1％
E.
O.5％
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举一反三
【单选题】Mercantilism
A.
is the philosophy of free international trade.
B.
was a system of export promotion and barriers to imports practiced by governments, especially in the 17th and 18th centuries.
C.
was praised by Adam Smith in The Wealth of Nations.
D.
Both A and
【单选题】Mercantilism
A.
is the philosophy of free international trade.
B.
was a system of export promotion and barriers to imports practiced by governments, especially in the 17th and 18th centuries.
C.
was praised by Adam Smith in The Wealth of Nations .
D.
Both A and
【单选题】在讨论充电系统调节时,技师甲说交流发电机需要限流;技师乙说励磁电流越大,输出电压越低。说法正确的是( )。
A.
技师甲
B.
技师乙
C.
两人均正确
D.
两人均不正确
【单选题】Me rcantilism ________.
A.
is the philosophy of free international trade
B.
was a system of export promotion and barriers to imports practiced by governments, especially in the 17th and 18th centuries
C.
was praised by Adam Smith in The Wealth of Nations
D.
Both A and C
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