200パスカルと1000パスカル、どちらの真空圧力の方が高いですか？
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200パスカルと1000パスカル、どちらの真空圧力の方が高いですか？ 粗真空とは何か、どのように定義されるのか？
これは負圧で表しているのですか、それとも真空度で表しているのですか？
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