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【单选题】
我国高压输电线路的最高电压等级是500KV，它指的是A.
线电压的有效值
B.
线电压的最大值
C.
相电压的有效值
D.
相电压的最大值
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举一反三
【判断题】Marginal revenue is the change in total revenue caused by selling one additional unit of output.
A.
正确
B.
错误
【判断题】Marginal cost is the change in total cost when one additional unit of output is produced.
A.
正确
B.
错误
【单选题】A firm's marginal cost can always be thought of as the change in total cost if
A.
the firm produces one more unit of output.
B.
the firm buys one more unit of capital.
C.
the firm's average cost increases by $1.
D.
the firm moves to the next highest isoquant.
【单选题】A firm's marginal cost can always be thought of as the change in total cost if ______
A.
the firm buys one more unit of capital.
B.
the firm produces one more unit of output.
C.
the firm moves to the next highest isoquant.
D.
the firm's average cost increases by $1.
【简答题】齿轮泵困油现象的产生原因是齿轮重合度ε≥ 1 ,会造成( )和( ),解决的办法是在泵盖上加工( ),为减小径向不平衡力齿轮泵的( )口小于( )口。
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