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【单选题】
()是采购工作的核心A.
签发采购订单
B.
接受、检验货物
C.
核对发票，划拨货款
D.
合同洽谈
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】体育教学过程的性质是( )、提高运动素质、学习知识和形成运动认知、( )、( )的过程。
【简答题】请点击链接,进入该网站复习上课尝过的单词: https://quizlet.com/_5ay5qz
【单选题】Which of the listed statements is correct concerning refrigeration systems?（）
A.
Dehydrators must be used continuously in a refrigeration system
B.
A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours
C.
A thermostatic expansion valve is used to control refrigerated space temperature
D.
The liquid receiver functions to collect and remove non- condensable gases
【单选题】In the refrigeration compressor the temperature of the vapor is _____ by compression.
A.
raised
B.
risen
C.
reduced
D.
maintained constant
【简答题】What was essential to a science of refrigeration according to the passage?
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