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【单选题】
镭是元素周期表中第七周期ⅡA族元素，下列关于镭的性质的叙述中不正确的是 [ ]A.
在化合物中呈+2价
B.
氢氧化物呈两性
C.
单质使水分解，放出氢气
D.
碳酸盐难溶于水
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反馈参考答案：
举一反三
【简答题】()是指经过门店各个入口而进入店内的顾客的数量
【单选题】The best title for this text would be______．
A.
How My Mother-In-Law Helped Me
B.
How I Received a Gold Watch I liked
C.
How I Made My Wife Travel With me
D.
How I Came to Marry My Wife
【简答题】在所有的基本味中，人对()味的感觉最快速，对()味的感觉最慢。
【单选题】The best title for this text would be ______.
A.
How My Mother-In-Law Helped Me
B.
How I Received a Gold Watch I Liked
C.
How I Made My Wife Travel With Me
D.
How I Came to Marry My Wife
【简答题】For CO2 shielded arc welding, short circuiting arc process or 1________ can promote the transfer feature effectively in low currents
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