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问题 单项选择题

母犬发情期的行为表现，说法不准确的是（）。

A、早期阴户肿大，末期有所消退

B、滴出的带血粘液减少

C、流出血的颜色由淡红变为鲜红

D、情绪烦躁且厌食

答案

参考答案：C

单项选择题

牙轮钻头的牙齿有（）两种。

A、铣齿和硬质合金齿

B、铣齿和钢齿

C、硬质合金齿和镶齿
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单项选择题

When the renewal verification is completed more than three months before the expiry date of the existing Document of Compliance or Safety Management Certificate, the new Document of Compliance or the new Safety Management Certificate should be valid from the date of （）for a period not exceeding five years.

A.beginningoftherenewalverification

B.completionoftherenewalverification

C.beginningofscheduleddrydocking

D.completionofscheduleddrydocking
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