挑战习题
1
/5
单选题
难度：
1.取一杯浑浊的河水，为除去其中的泥沙（固体悬浮物），下列净水方法中最好采用
A
加絮凝剂
B
加活性炭吸附
C
过滤
D
蒸馏
提示1：
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正确答案：
Qw==
6Zmk5Y675rC05Lit5Zu65L2T5oKs5rWu54mp55qE5a6e6LSo5piv5YiG56a75Zu65ray5re35ZCI54mp77yM6KaB6YeH55So6L+H5ruk55qE5pa55rOV77yM6JK46aaP5Li76KaB5piv6Zmk5Y675Y+v5rq25oCn5p2C6LSo55qE77yM5Yqg6YCf5Yed5YmC5ZKM55So5rS75oCn54Kt5ZC46ZmE5LiN6IO95b6I5aW955qE6Zmk5Y675Zu65L2T5p2C6LSo77yM5pWF6Zmk5Y675rC05Lit55qE5rOl5rKZ5pyA5aW955qE5pa55rOV6L+Y5piv6L+H5ruk77yOPGJyPuaVhemAiUPvvI4=
2
/5
单选题
难度：
2.今年在我国好多地区都发生了严重的地质灾害，灾区人民解决饮用水的应急方法是将河水静置过滤，若在实验室进行过滤操作，下列仪器不需要的是
A
漏斗
B
酒精灯
C
玻璃棒
D
烧杯
提示1：
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正确答案：
Qg==
6L+H5ruk5LiN6ZyA6KaB5Yqg54Ot77yM5Zug5q2k5LiN6ZyA6KaB6YWS57K+54Gv44CC
3
/5
单选题
难度：
3.下列混合物可以用过滤法分离的是①含泥沙的精盐
②浑浊的河水
③含有沙子的大米
④食盐和白糖．
A
①②
B
①②③
C
①②④
D
②
提示1：
6L+H5ruk6L+Z5Liq5pON5L2c5Y+q6IO95bCG5ray5L2T5Lit55qE5LiN5rq254mp6Zmk5Y6744CC
提示2：
6KaB5bCG5Zub5Liq6YCJ6aG55Lit55qE54mp6LSo5YiG5Yir5YiG56a777yM6ZyA6KaB6YCJ6aG55Lit55qE5Lik56eN54mp6LSo5YW25Lit5LiA56eN5rq25LqO5rC077yM5Y+m5LiA56eN54mp6LSo5LiN5rq25LqO5rC044CC
正确答案：
QQ==
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
4
/5
单选题
难度：
4.以下关于过滤的操作中，不正确的是
A
液体沿玻璃棒流进过滤器
B
漏斗里的液体液面要低于滤纸边缘
C
漏斗下端的管口靠紧烧杯的内壁
D
为加速过滤，用玻璃棒搅动漏斗里的液体
提示1：
6L+H5ruk5a6e6aqM5Lit77yM5ruk57q45rK+5rC05ZCO5b6I5a655piT56C05o2f77yM5Zug5q2k546755KD5qOS5bqU5bC96YeP5bCR6Kem56Kw5ruk57q477yM5Zyo5byV5rWB5pe25Lmf6KaB5o6l6Kem5LiJ5bGC5ruk57q45aSE44CC
正确答案：
RA==
QeOAgeW8lea1geaXtua2suS9k+ayv+eOu+eSg+ajkua1gei/m+i/h+a7pOWZqO+8jOaVhUHmraPnoa7vvJsgQuOAgea8j+aWl+mHjOeahOa2suS9k+a2sumdouW6lOS9juS6jua7pOe6uOi+uee8mO+8jOaVhULmraPnoa7vvJs8YnI+Q+OAgea8j+aWl+S4i+err+eahOeuoeWPo+imgee0p+mdoOeDp+adr+WGheWjgeaYr+ato+ehrueahO+8jOaVhUPmraPnoa7vvJs8YnI+ROOAgeiLpeeUqOeOu+eSg+ajkuWcqOa8j+aWl+mHjOaQheaLjO+8jOS8muS9v+a7pOa2sua1kea1iu+8jOW5tuS4lOS8muW8hOegtOa7pOe6uOS9v+i/h+a7pOWksei0pe+8jOaJgOS7peWBmuazlemUmeivr+OAgjxicj7mlYXpgIk6RC4=
5
/5
单选题
难度：
5.下列操作正确的是
A
过滤时，液面要高于滤纸边缘
B
过滤时，要用玻璃棒在漏斗中不时地搅拌，加快过滤速度
C
滤纸边缘要低于漏斗口
D
一杯浑浊的液体，过滤时只能一次性倒入过滤器中过滤
正确答案：
Qw==
Qemhue+8jOi/h+a7pOaXtu+8jOa2sumdouimgeS9juS6jua7pOe6uOi+uee8mO+8mzxicj5C6aG577yM546755KD5qOS5Y+q5piv55So5LqO5byV5rWB77yM5pCF5ouM5b6I5a655piT5byE56C05ruk57q477yM5LuO6ICM5b2x5ZON6L+H5ruk55qE5pWI5p6c44CCPGJyPkPpobnvvIznrKblkIjigJzkuInkvY7igJ3nmoTopoHmsYLvvJs8YnI+ROmhue+8jOWcqOi/h+a7pOaXtuimgeS/neivgea2sumdouS4jemrmOS6jua7pOe6uOi+uee8mO+8jOWboOatpOS4jeiDveWwhuaJgOaciea2suS9k+S4gOasoeaAp+WAkuWFpea8j+aWl+S4reOAgjxicj7mlYXpgInmi6lD6aG544CC