设函数y=f(x)在点x_0可导,当自变量由x_0增至x_0+Δx时,记Δy为f(x)的增量,dy为f(x)的微分,则(Δy-dy)/Δx→( )(当Δx→0时)。
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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