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[主观题]
将12345678分别填在下面的方框里,12345678这8个数且每个数只能用一次:①式:()+()=9②式:()-()=1③式:()-()=2④式:()+()=7
将12345678分别填在下面的方框里,12345678这8个数且每个数只能用一次:
①式:()+()=9
②式:()-()=1
③式:()-()=2
④式:()+()=7
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将12345678分别填在下面的方框里,12345678这8个数且每个数只能用一次:
①式:()+()=9
②式:()-()=1
③式:()-()=2
④式:()+()=7
A.1○2○3
B.1○2○4
C.2○3○4
D.3○4○1
A.②④①③
B.①④②③
C.④②③①
D.④③②①
A.②④①③
B.①④②③
C.④②③①
D.④①②③
(1)向稀硫酸中逐滴加入氢氧化钠溶液_______________;
(2)向氢氧化钠溶液中逐滴加水稀释_______________;
(3)向水中不断通入二氧化碳_______________;
(4)向水中加入熟石灰_______________。