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【单选题】
纯碱和小苏打都是白色晶体,要在家庭将它们区分开,下面的方法可行的是 A .分别放在炒锅中加热,观察是否有残留物 B .分别用干净铁丝蘸取样品在煤气火焰上灼烧,观察火焰的颜色 C .在水杯各盛相同质量的样品,分别加入等体积的白醋,观察反应剧烈的程度 D .将样品溶解,分别加入澄清石灰水,观察是否有白色沉淀A.
1
B.
2
C.
3
D.
4
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皮皮学刷刷变学霸
举一反三
【单选题】S1:You shouldn't eat so quickly!S2:I'm starving. And the food is so good that I can't help it.S1:Chewing your food well keeps you in good health.S2:I see.S1:Don't you like vegetables?S2:Yes,I do.Veget...
A.
Eating fast.
B.
Speaking while eating.
C.
Eating with hands.
D.
Eating too much.
【单选题】What’s the use of keeping the secret ______ everyone has already known it?
A.
as though
B.
now that
C.
before long
D.
in case
【简答题】总结一下自己在小车安装过程中的收获和心得。
【简答题】Though everyone now seems to prefer coffee over tea, they are unaware of the many health_______ tea has to offer.
【单选题】S1:You shouldn't eat so quickly!S2:I'm starving. And the food is so good that I can't help it.S1:Chewing your food well keeps you in good health.S2:I see.S1:Don't you like vegetables?S2:Yes,I do.Veget...
A.
Vegetables.
B.
Meat only.
C.
Meat and fish.
D.
Fish only.
【简答题】作为附件上传实验报告_C。
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