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【单选题】
用双指示剂法测定可能含有氢氧化钠、碳酸钠、碳酸氢钠或它们混合物的样品,若用盐酸标准溶液滴定至酚酞变色时消耗盐酸标准溶液的体积为Va ml,滴定至甲基橙变色时消耗盐酸标准溶液的体积为Vb ml,已知Va=Vb,则物质的组成为( )A.
氢氧化钠
B.
碳酸钠
C.
氢氧化钠和碳酸钠
D.
碳酸氢钠
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皮皮学刷刷变学霸
举一反三
【单选题】The happiest people don't have the best of everything. They just _______ everything.
A.
get away from
B.
make the best of
C.
fix attention on
D.
catch up with
【单选题】下列关于真菌性鼻窦炎哪项不正确：
A.
最常见的病菌是曲霉菌属
B.
真菌球以额窦发病率最高
C.
最凶险的类型是急性侵袭性真菌性鼻-鼻窦炎
D.
真菌球术后不需配合抗真菌药物治疗
【单选题】Some managers , when they let their insecurity get the best of them, ____.(Text A)
A.
lead by intimidation
B.
create a team where staff feel valued
C.
create a team where staff feel equal
D.
create a team where staff feel needed
【简答题】程序填空:在页面上输出如下数字图案。 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 其中, 每行的数字之间有一个空格间隔。 for (num=1;num"); }
【简答题】_ _ Normally , college students can hardly take advantages of discounts and freebies. However , they can go to the best place to get the best deal in sale season and clearance. (Para.D)
【判断题】Normally , college students can hardly take advantages of discounts and freebies. However , they can go to the best place to get the best deal in sale season and clearance. (Para.D)
A.
正确
B.
错误
【简答题】They get the best of both worlds, with a little of the grassy flavor of a green tea, but also some of the_______ bold flavor of a black tea.
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