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【单选题】
船舶在港内时值班驾驶员应：（）I、注意天气变化，及时开关舱，防止货损；II、按要求看水尺并记入航海日志；III、装卸结束封舱前，舱检查火灾隐患、有无偷渡迹象；IV、发现违章装卸及时制止，引起货物残损，立即要求其负责人签认
A.
I~IV
B.
I~III
C.
I、II、IV
D.
II、III、IV
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because there are close substitutes for the firm's product
B.
because the firm is protected by barriers to entry
C.
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All of the above are reasons why a monopoly can earn an economic profit in the long run.
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shortening the time-length of innovations
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minimizing the costs of innovations
D.
maximizing the profits of innovations
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