缺Mo症状
1老叶脉间淡绿发黄,有褐色斑点; 2叶缘焦枯卷曲,叶片有畸形,生长不规则; 3豆科不结根瘤或结瘤少; 4十字花科叶片瘦长,螺旋状扭曲,老叶变厚焦枯。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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