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题目内容
（运营管理）
“Custom and practice” agreement are usually ______________ .
· included ithe contract
· knowto employees only
· always writteclearly ithe contract
·signed by both the employer and a trade union
· included ithe contract
· knowto employees only
· always writteclearly ithe contract
·signed by both the employer and a trade union
参考答案
