理想流体与实际流体的区别仅在于,理想流体具有不可压缩性。( )
闸孔出流的流量与闸前水头的1/2次方成正比。
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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