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【单选题】
熔断器在电路中起到()保护的作用,热继电器在电路中起到()保护作用,接触器在电路中起到()保护作用A.
过载，欠压，短路
B.
过载，过载，短路
C.
短路，过载，欠压
D.
短路，欠压，过载
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举一反三
【单选题】Refer to the Figure. This indifference map shows that: this consumer:【图片】
A.
prefers a car with more acceleration and less space.
B.
prefers more expensive rather than less expensive cars.
C.
is indifferent between acceleration and space at all levels of utility.
D.
all of the above
【单选题】【图片】Refer to the Figure. The effect of a decrease in the price of food, as depicted in the figure, leads us to believe that:
A.
food in an inferior good and clothing a normal good.
B.
food in a normal good and clothing an inferior good.
C.
both food and clothing are normal goods.
D.
both food and clothing are inferior goods.
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