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【简答题】
食品微生物污染的危害 主要有 , , , 。
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反馈参考答案：
举一反三
【简答题】计算机执行用高级语言编写的程序主要有两种途径: 和
【判断题】An invitation letter is a kind of social letter,it is divided into formal invitation and informal invitation.
A.
正确
B.
错误
【单选题】The content of an invitation letter usually include ___________.
A.
introducing oneself and sending invitation
B.
introducing the conference and relevant details
C.
expressing a strong wish that the invitee can accept the invitation
D.
all the answers are right.
【单选题】A business invitation letter serves the purpose of inviting a () to a party, an event or a celebration while conveying more information than a traditional invitations card.
A.
host
B.
guest
C.
worker
D.
collegue
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