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【多选题】
下面的说法正确的有（）A.
节气门不定期清洗，会导致节气门的开度产生误差。
B.
如果火花塞螺纹和绝缘体有任何损坏，则更换火花塞。
C.
点火线圈是将蓄电池或发电机输出的低压电转变为高压电的升压变压器。
D.
燃油压力表是检测燃油供给和喷射系统工作是否正常的工具。
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举一反三
【单选题】The difference between production possibilities frontiers that are bowed out and those that are linear is that
A.
bowed out production possibilities frontiers illustrate tradeoffs where linear production possibilities frontiers do not.
B.
bowed out production possibilities frontiers show increasing opportunity cost where linear ones show constant opportunity cost.
C.
bowed out production possibilities frontiers are the result of perfectly shiftable resources where linear production possibilities frontiers are not.
D.
linear production possibilities frontiers illustrate real world conditions more than bowed out production possibilities frontiers.
【判断题】The production possibilities frontier is bowed outward because the trade-offs between the production of any two goods are constant.
A.
正确
B.
错误
【单选题】The concavity (bowed-out shape) of the production possibilities curve is the result of:
A.
the law of demand.
B.
the law of supply.
C.
the law of increasing opportunity cost.
D.
complementarily in consumption.
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