单元体是由三对________的面组成,由于单元体极其微小,可以认为它的每个面上的应力是________分布的,而且在________的面上
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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