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【多选题】
下列关于基本偏差的论述中，正确的有______。A.
基本偏差数值大小取决于基本偏差代号
B.
轴的基本偏差为下极限偏差
C.
基本偏差的数值与公差等级无关
D.
的基本偏差为上极限偏差
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】为研究盛装浓硫酸的铁质材料(碳素钢)与热浓硫酸的反应,某学习小组进行了以下探究活动： [实验] 称取铁钉5.6g放入15.0mL浓硫酸中，加热，充分应后得到溶液X并收集到气体Y。 ①甲同学认为X中除 外还可能含有 。若要确认其中的 ，应选用 ( 选填序号）。 a.KSCN溶液和氯水 b.铁粉和KSCN溶液 c.浓氨水 d.酸性 溶液 ②乙同学取448mL（标准状况）气体Y通入足量...
【单选题】Mind Those Manners on the Subway So, there you are, just sitting there in the subway car, enjoying that book you just bought.______(46) Or, the person sitting next to you takes out a nail clipper (指甲刀...
A.
Don’t eat food in your car．
B.
Don’t shout into your mobile phone on a bus or subway．
C.
We all know that some behaviors are simply unacceptable．
D.
Many people do this on subways，but it's really annoying．
E.
Getting off and on in an orderly manner can save time for all．
F.
Suddenly，you feel someone leaning over your shoulder reading along with you．第 46 题 请选择（46）处的最佳答案．
【单选题】Mind Those Manners on the Subway So, there you are, just sitting there in the subway car, enjoying that book you just bought. __________(46) Or, the person sitting next to you takes out a nail clipper...
A.
Don't eat food in your car.
B.
Don't shout into your mobile phone.on a bus or subway.
C.
We all know that some behaviors are simply unacceptable.
D.
Many people do this on subways, but it's really annoying.
E.
Getting off and on in an orderly manner can save time for all.
F.
Suddenly, you feel someone leaning over your shoulder reading along with you. 第 46 题 请选择（46）处的最佳答案．
【简答题】(14分)为研究盛装浓硫酸的铁质材料(碳素钢)与浓硫酸的反应，某学习小组进行了以下探究活动： [实验]取一铁钉放入一定体积浓硫酸中，加热，充分反应后得到溶液X并收集到气体Y。 ①甲同学认为x中除Fe 3+ 外还可能含有Fe 2+ 。若要确认其中的Fe 2+ ，应选用 (选填序号) KSCN溶液和氯水 b．铁粉和KSCN溶液 c．浓氨水 d．酸性：KMn0 4 溶液 ②为分析气体成分，乙...
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