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【简答题】

酸洗石棉绒使用前需在 800℃下灼烧 30min。

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题目标签：酸洗石棉石棉绒洗石
参考答案：
参考解析：
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A.
asbestos is damp
B.
dry asbestos is employed
C.
workers wear protective clothing
D.
workers use asbestos in the open air
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【单选题】清洗石英舟用到以下哪种化学品：
A.
H2SO4
B.
HNO3
C.
KOH
D.
HF
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【判断题】对挥发分很大的易飞溅的煤样燃烧时，可在坩埚底部铺一层石棉绒。
A.
正确
B.
错误
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【单选题】In 1967, in response to widespread public concern aroused by medical reports of asbestos(石棉绒) related deaths, NMRC organized a committee of enquiry to investigate the health threats ,associated with t...
A.
only when asbestos is used in building industry
B.
only when it is used in large quantities
C.
even if it is used in small quantities
D.
if they are used when wet rather than dry
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【单选题】测定低发热量煤使用酸洗石棉绒，在使用前应在多少温度下灼烧多长时间？（）
A.
800 ℃，30 分钟
B.
815 ℃，30 分钟
C.
900 ℃，25 分钟
D.
920 ℃，20 分钟
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【判断题】煤的发热量测定中，酸洗石棉绒在使用应在800℃下灼烧30min。
A.
正确
B.
错误
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【填空题】勾缝需经过洗石、（）、紧密、干刷、湿刷、养护七道工序。
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【单选题】清洗石英制品用到得是以下那种化学品
A.
H2SO4
B.
HNO3
C.
KOH
D.
HF
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【简答题】如图学习小组甲、乙所示进行乙醇的催化氧化实验，试管A中盛有无水乙醇，B中装有Cu或CuO(用石棉绒作载体)，C中装的是蒸馏水。请回答下列问题： 甲 乙 ⑴甲中B内放置的是 ； 乙中B内放置的是 。 乙向试管A中鼓入空气的目的是_____________________。 ⑵甲乙装置中A试管为什么都要水域加热： 。 ⑶甲中玻璃管中可观察到的现象是_____________________...
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【单选题】In 1967, in response to widespread public concern aroused by medical reports of asbestos(石棉绒) related deaths, NMRC organized a committee of enquiry to investigate the health threats ,associated with t...
A.
only when asbestos is used in building industry
B.
only when it is used in large quantities
C.
even if it is used in small quantities
D.
if they are used when wet rather than dry
查看完整题目与答案