施用沼肥应注意什么?
①忌出池后立即施用。②忌不兑水直接追施沼肥。③忌表土撒施沼肥。④忌过量施用。⑤忌与草木灰、石灰等碱性肥料混施。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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