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【判断题】
跟踪出站调车,只准许在单线区间及双线正方向线路上办理。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】A profit-maximizing firm that is operating in the short run will sell an additional unit of output as long as:
A.
as doing so reduces the firm's per-unit costs.
B.
doing so reduces the firm's marginal costs.
C.
doing so adds more to revenue than it adds to cost.
D.
there is additional plant capacity with which to produce.
【单选题】设函数 在 内连续,其导函数的图形 如图所示,则( )
A.
函数 有2个极值点,曲线 有2个拐点;
B.
函数 有2个极值点,曲线 有3个拐点;
C.
函数 有3个极值点,曲线 有1个拐点;
D.
函数 有3个极值点,曲线 有2个拐点.
【单选题】The additional cost imposed on society as a whole by an additional unit of pollution is:
A.
the marginal social benefit of pollution.
B.
the marginal social cost of pollution.
C.
the optimal Pigouvian tax.
D.
a technology spillover.
【简答题】煤气加压机检修送煤气后要检查所有连接部位和隔断装置是否泄漏（）。
【单选题】According to the law of diminishing returns, an additional unit of
A.
capital produces more output than an additional unit of labor.
B.
labor decreases output.
C.
labor produces more output than the previous unit.
D.
labor produces less output than the previous unit.
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