运价的形成机制,是指依据一定的_______原理,通过价值规律的作用而形成的价格决策制度。
— What would you like to have, meat or fish?
— _____________________.
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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