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【单选题】
某人愿意用200第一件衬衫，愿意用350两件衬衫。第二件衬衫的边际效用是多少？（ ）。A.
150
B.
350
C.
550
D.
275
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皮皮学刷刷变学霸
举一反三
【单选题】The people of El Hierro ( ).
A.
need to buy all of their oil
B.
need to buy 30% of their oil
C.
don't need to buy any oil
【简答题】操纵基因(operator，operator gene，O)
【单选题】在某类的公共部分有声明string operator++()；和string operator++(int)；则说明
A.
string operator++()；是前置自增运算符声明
B.
string operator++()；是后置自增运算符声明
C.
string operator++(int)； 是前置自增运算符声明
D.
两条语句无区别
【单选题】The operator of electrical motors should keep a constant check on the loads they carry because _____.
A.
low loads necessitate frequent insulation cleaning
B.
exceeding nameplate values shortens useful life
C.
energy is wasted if full loading is not utilized
D.
power factor correction methods are load dependent
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