计量认证项目和审查认可(验收)项目，证书期限一般为( )年。A．5 B．6 C．4
题型：单项选择题
问题：
计量认证项目和审查认可(验收)项目，证书期限一般为( )年。
A．5
B．6
C．4
D．3
题型：单项选择题
开放作文。
请根据下面提示，写一篇短文。词数不少于50。
In your English class, the teacher shows the picture below and asks the class to discuss it. Your
classmates may have different understandings. Look at the picture carefully and tell the crass how
YOU understand it.
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