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霜霉病症状的共同特点是都在病部产生白色霜霉状物。上述表述( )

判断题
2021-09-01 23:22
A、正确
B、错误
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正确答案
B

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影响十字花科蔬菜霜霉病发病因素有哪些?
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论述防治葡萄霜霉病的主要措施。
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