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【简答题】
根据如图所示装置，结合所学知识回答下列问题． （1）写出图中标号的仪器名称：①______，②______； （2）①实验室用高锰酸钾制取氧气，用的发生装置是______（填字母），发生反应的化学方程式是______，实验时该装置试管口一团棉花，其目的是______； ②制氧时，小明同学未能收集到两瓶氧气，其可能的原因有______（填序号）； A．没有塞紧橡皮塞B．试管口没有放棉花 C．没有及时更换收集第二瓶D．加热前已将集气瓶灌满水倒立于水槽中 （3）①实验室用大理石和稀盐酸反应制取CO 2 ，择的发生装置是______（填字母）．如果选用图E来收集气体，则气体应从______（填“a”或“b”）端进入． ②小明同学想把制取二氧化碳结束后的废液未经处理直接倒入下水道，可能造成的危害是______（写一条）．
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