本课配套习题挑战模式1/5
单选题
难度系数:
1.物质在“潮湿的空气”中发生的变化,主要与空气中某些气体有关,下列说法不正确的是
A: 钢铁生锈与氧气、水蒸气有关 |
B: 生石灰堆放久了变质与氧气、水蒸气有关 |
C: 铜器表面生成铜绿与氧气、二氧化碳、水蒸气有关 |
D: 氢氧化钠固体潮解、变质与水蒸气、二氧化碳有关 |
一次做对,真牛!
+5奖励规则>
- 提示1:55Sf55+z54Gw55qE5Y+Y6LSo5piv5YWI5LiO5rC05Y+R55Sf5Y+N5bqU5Y+Y5oiQ54af55+z54Gw77yM57un6ICM5LiO5LqM5rCn5YyW56Kz5Y+R55Sf5Y+N5bqU44CC
- 答案:Qg==
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
本课配套习题挑战模式2/5
单选题
难度系数:
2.为预防自行车生锈,下列做法中不合理的是
A: 车架表面喷涂油漆 |
B: 钢圈表面镀防护金属 |
C: 链条表面涂机油 |
D: 露天放置,日晒雨淋 |
一次做对,真牛!
+5奖励规则>
- 提示1:5pys6aKY6L6D5Li6566A5Y2V44CC5bCG56m65rCU5LiO6YeR5bGe6ZqU56a75Y+v5Lul6LW35Yiw6Ziy5oqk5L2c55So44CC
- 答案:RA==
6Ziy5q2i6Ieq6KGM6L2m55Sf6ZSI55qE5o6q5pa95piv5L+d5oyB6ZOB5Yi25ZOB6KGo6Z2i55qE5riF5rSB5bmy54el77yM5oiW6ICF5Zyo54m55Yi25ZOB6KGo6Z2i5raC5L+d5oqk5bGC77yM5L2G5pel5pmS6Zuo5reL5Lya5Yqg5Ymn5a625YW355Sf6ZSI55qE6YCf5bqm44CC
本课配套习题挑战模式3/5
单选题
难度系数:
3.光亮的铁钉在下列几种情况下,最不容易生锈的是
A: |
B: |
C: |
D: |
一次做对,真牛!
+5奖励规则>
- 提示1:5Y+q5pyJ5qSN54mp5rK55Y+v5Lul5pyJ5pWI55qE6ZqU57ud56m65rCU77yM6ICM5rC05Lit5piv5rq26Kej5pyJ5bCR6YeP56m65rCU55qE44CC
- 答案:Qg==
6ZOB55Sf6ZSI6ZyA6KaB5ZCM5pe25o6l6Kem5rCn5rCU5ZKM5rC077yM57y65LiA5LiN5Y+v44CCQeS4reaOpeinpuawp+awlOOAgeawtO+8jOS4lOaOpeinpumjn+ebkOawtO+8jOeUn+mUiOmAn+W6puacgOW/q++8m0LkuK3kuI3mjqXop6bmsKfmsJTlkozmsLTvvIzmnIDkuI3lrrnmmJPnlJ/plIjvvJtD5o6l6Kem5rCn5rCU5L2G56m65rCU5Lit5rC06JK45rCU5ZCr6YeP6L6D5bCR77yM55Sf6ZSI6YCf5bqm6L6D5oWi77ybROaXouaOpeinpuawp+awlOWPiOaOpeinpuawtO+8jOi+g+aYk+eUn+mUiOOAgg==
本课配套习题挑战模式4/5
单选题
难度系数:
4.如图所示,将盛有铁屑的量筒塞上蓬松的棉花,然后倒置在水中(固体装置已略去)。数天后,他观察到的现象是
A: 铁屑不生锈,量筒内液面上升 |
B: 铁屑不生锈,量筒内液面不上升 |
C: 铁屑生锈,量筒内液面上升 |
D: 铁屑生锈,量筒内液面不上升 |
一次做对,真牛!
+5奖励规则>
- 提示1:6ZOB55Sf6ZSI6ZyA6KaB5raI6ICX5Lik5Liq5p2h5Lu277ya56m65rCU5ZKM5rC0
- 答案:Qw==
5Zug5Li66ZOB5Zyo5r2u5rm/55qE56m65rCU5Lit5LiO5rC05ZKM5rCn5rCU5Y+N5bqU55Sf5oiQ6ZOB6ZSI77yM55Sx5LqO5raI6ICX5LqG6YeP562S5Lit55qE5rCn5rCU77yM5Y6L5by65YeP5bCP77yM5pWF55yL5Yiw55qE546w6LGh5Li66ZOB5bGR55Sf6ZSI77yM6YeP562S5YaF5ray6Z2i5LiK5Y2H77yM5pWF562U5qGI6YCJ5oupQw==
本课配套习题挑战模式5/5
单选题
难度系数:
5.铁在潮湿的空气里会发生锈蚀,证明氧气一定参加了反应必须要做的实验是
A: ①② |
B: ①③ |
C: ②③ |
D: ①②③ |
一次做对,真牛!
+5奖励规则>
- 提示1:6Kej6aKY5YWz6ZSu5piv5piO56Gu6ZOB55Sf6ZSI55qE5Lik5Liq5p2h5Lu277yM5Y2z5LiO5rCn5rCU5ZKM5rC05ZCM5pe25o6l6Kem
- 提示2:5q2k57G75a6e6aqM5o6i56m26aKY6KaB5o6n5Yi25Y+Y6YeP77yM5LiN5ZCM55qE5p2h5Lu25Li65oOz6KaB56CU56m255qE5p2h5Lu244CC
- 答案:QQ==
4pGg5Lit6ZOB6ZKJ5LiO5rC05ZKM5rCn5rCU5ZCM5pe25o6l6Kem77yM6ZOB6ZKJ55Sf6ZSI77yM4pGh5Lit6ZOB6ZKJ5pyq5LiO5rCn5rCU5o6l6Kem5LiN55Sf6ZSI77yM5LuO6ICM6K+05piO6ZOB55Sf6ZSI5b+F6aG75pyJ5rCn5rCU5Y+C5Yqg44CC