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【简答题】
等质量的M、N两种金属，分别与相同质量分数的足量稀盐酸反应（已知M、N在生成物中均为+2价），生成氢气质量和反应时间的关系如图所示，请回答： （1）M、N两种较活泼的是______；相对原子质量较大的是______． （2）分析图中的两条曲线，从还能得到哪些结论：______．
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举一反三
【判断题】The Forbidden City was constructed during the Qing Dynasty, and became the imperial palace to the end of the Qing Dynasty.
A.
正确
B.
错误
【单选题】The Qiao Family Grand Courtyard was a Traditional Qing Dynasty quadrangle Mansion and it belonged to a _______merchant during the Qing dynasty.
A.
Shanxi
B.
Shaanxi
C.
Gansu
D.
Qinghai
【简答题】图书和期刊作为特殊的商品也采用了( )表示其ISBN和ISSN号,图书号ISBN用( )为前缀,我国被分配( )开头的ISBN号。
【判断题】Ren Bonian at the close of the Ming Dynasty and Chen Hongshou at the close of the Qing Dynasty were outstanding representatives of those painters.
A.
正确
B.
错误
【单选题】They did everything in their power to save the building dating back to the Qing Dynasty, but their efforts were _______.
A.
in turn
B.
in time
C.
in vain
D.
in need
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