The boy lost his key, so he has no choice but till his mother came home.
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某多肽的化学式为C53H66O19N10,将它彻底水解得到三种氨基酸:甘氨酸(C2H5NO2),苯丙氨酸(C9H11NO2),谷氨酸(C5H9NO4)则此多肽中有肽键数为
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As usual, the school __________ (集会) is on Monday morning.
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一定条件下,甲、乙、丙、丁四种物质在密闭容器中反应,测得反应前后各物质的质量分数如图所示,下列说法正确的是( )
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时针从3:00到6:00,旋转了________°;从7时到7时10分,分针旋转了________°
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1年前