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【简答题】
取一根用砂纸打磨干净的镁条和一个石棉网，将他们一起放在托盘天平上称量，然后在石棉网上方将镁条点燃，镁条燃烧时发出耀眼的，产生大量白烟，再将镁条燃烧后的产物与石棉网一起放在托盘天平上称量，发现质量减轻了．有同学据此认为“质量守恒定律不是普遍规律”，这种说法对吗，为什么？
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参考答案：
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【单选题】牵引变电所要按规定配备消防设施和急救药箱。当电气设备发生火灾时，要立即将该设备的（）切断，然后按规定采取有效措施灭火。
A.
水源
B.
电源
C.
气源
查看完整题目与答案
【简答题】牵引变电所要按规定配备消防设施和急救药箱。当电气设备发生火灾时,要立即将该设备的 ____________ 切断,然后按规定采取有效措施灭火。
查看完整题目与答案
【多选题】当电气设备发生火灾时,要注意哪些,以下表述正确的有( )
A.
要立即将该设备的电源切断
B.
切断电源后按规定采取有效措施灭火
C.
牵引变电所要按规定配备消防设施和急救药箱。
D.
立即向供电调度汇报,经许可后将该设备的电源切断
查看完整题目与答案
【简答题】His bright clothes were not______a funeral. A．fit B．appropriate of C．appropriate for D．suit
查看完整题目与答案
【简答题】A．She wears clothes similar to those of his wife’s. B．She wears clothes that were the same as his wife's. C．She wears clothes which were different form. those of his wife's. D．She wears clothes Which ...
查看完整题目与答案
【简答题】当电气设备发生火灾时,要立即将该设备的_____切断,然后按规定采取有效措施灭火。
查看完整题目与答案
【单选题】关于月球的成因有好多种,不包括()。
A.
同源说
B.
分裂说
C.
爆炸说
D.
俘获说
查看完整题目与答案
【单选题】Why was Brian wearing so many clothes for his travel?
A.
Because they were the uniforms for air couriers
B.
Because that made him easier to be recognized
C.
Because his backpack had no room for his clothes
D.
Because he did not have any luggage with him
查看完整题目与答案
【判断题】当电气设备发生火灾时，要立即将该设备的电源切断，然后按规定采取有效措施灭火
A.
正确
B.
错误
查看完整题目与答案
【单选题】牵引变电所要按规定配备消防设施和急救药箱。当电气设备发生火灾时,要立即将该设备的( )切断,然后按规定采取有效措施灭火。
A.
电源
B.
水源
C.
气源
D.
油源
查看完整题目与答案
相关题目：
【单选题】牵引变电所要按规定配备消防设施和急救药箱。当电气设备发生火灾时，要立即将该设备的（）切断，然后按规定采取有效措施灭火。
A.
水源
B.
电源
C.
气源
查看完整题目与答案
【简答题】牵引变电所要按规定配备消防设施和急救药箱。当电气设备发生火灾时,要立即将该设备的 ____________ 切断,然后按规定采取有效措施灭火。
查看完整题目与答案
【多选题】当电气设备发生火灾时,要注意哪些,以下表述正确的有( )
A.
要立即将该设备的电源切断
B.
切断电源后按规定采取有效措施灭火
C.
牵引变电所要按规定配备消防设施和急救药箱。
D.
立即向供电调度汇报,经许可后将该设备的电源切断
查看完整题目与答案
【简答题】His bright clothes were not______a funeral. A．fit B．appropriate of C．appropriate for D．suit
查看完整题目与答案
【简答题】A．She wears clothes similar to those of his wife’s. B．She wears clothes that were the same as his wife's. C．She wears clothes which were different form. those of his wife's. D．She wears clothes Which ...
查看完整题目与答案
【简答题】当电气设备发生火灾时,要立即将该设备的_____切断,然后按规定采取有效措施灭火。
查看完整题目与答案
【单选题】关于月球的成因有好多种,不包括()。
A.
同源说
B.
分裂说
C.
爆炸说
D.
俘获说
查看完整题目与答案
【单选题】Why was Brian wearing so many clothes for his travel?
A.
Because they were the uniforms for air couriers
B.
Because that made him easier to be recognized
C.
Because his backpack had no room for his clothes
D.
Because he did not have any luggage with him
查看完整题目与答案
【判断题】当电气设备发生火灾时，要立即将该设备的电源切断，然后按规定采取有效措施灭火
A.
正确
B.
错误
查看完整题目与答案
【单选题】牵引变电所要按规定配备消防设施和急救药箱。当电气设备发生火灾时,要立即将该设备的( )切断,然后按规定采取有效措施灭火。
A.
电源
B.
水源
C.
气源
D.
油源
查看完整题目与答案
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