某乡播种早稻 5000亩,其中 20%使用改良品种,亩产为 600 公斤,其余亩产为 500 公斤,则该乡全部早稻亩产为
Goods are carried by several of transport--on road or rail, by sea or air.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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