全国各地中考真题:河北省2017年中考生物真题试题(含答案)
河北省2017年中考生物试题第Ⅰ卷单项选择题本卷包括15道小题,每小题1分,共15分。在每小题提供的四个选项中,只有一项是最符合题目要求的。1.为研究饮水机中细菌的生存条件,有人将同一桶纯净水每隔3天,分别从冷水口和热水口接等量的饮用水,测定细菌数量,结果如下表所示。下列说法错误的是测定时间第1天第4天第7天第10天冷水口细菌数345609351220热水口细菌数1532546A.若用饮水机只喝冷水,应尽快将整桶水喝完B.使用饮水机喝热水比喝冷水更有利于身体健康C.本实验只能探究时间对饮水机中细菌生存的影响D.冷水口接的饮用水中细菌数量随时间延长而增多2.下列实验操作与其目的对应错误的是A.使...
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