一个圆柱的侧面展开图是一个面积为4平方单位的矩形，那么这个圆柱的母线长L和底面半径r之间的函数关系是[]A．反比例函数B．正比例函数C．一次函数D．二次函数-八年级数学

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• 形如（k是常数，且k≠0）的函数称为（），其中x是自变量的取值范围是（），y是函数，k是比例系数。-八年级数学
• 反比例函数y=-中，比例系数k=（）。-九年级数学
• Thelittleboystoodbeforetheshopwindow,______hiseyesonthetoybearinit.[ ] A.havingkeptB.keptC.beingkept
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• At this moment the bell rang, ________ the end of class.[ ]A. announced B. having announcedC. announ
• _______ any reply, he had to send a second request.[ ]A. Not to receive B. Having not received C. No
• _____ a reply, he decided to write again. [ ]A. Not receiving B. Receiving notC. Not having received
• _____ in the film The Water Margin as Song Jiang has helped actor Zhang Hang Yu gain more fans. [ ]A
• _____ full preparations, we decided to put off the party till next week. [ ]A. We did not make B. Ha
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