题目内容
（请给出正确答案）
[单选题]
引起马铃薯晚疫病的病原是（）。
A.卵菌
B.接合菌
C.担子菌
D.镰刀菌
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更多“引起马铃薯晚疫病的病原是（）。”相关的问题
第6题
Directions: Read the case carefully and decide which is the best “subject line”. David will visit China and attend a technology conference in Shanghai. During his stay there, he will also visit two lo
A、Write David an email about this with the subject “Travel Update”.
B、Write David an email about this with the subject “ Two Changes in Your Shanghai Itinerary”.
C、Write David an email about this with the subject “ Urgent-Two Important Changes in Your Shanghai Itinerary”.
D、Write David an email about this with the subject “ Urgent”.
，则B相电流为（ ）。
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