—What is the of the sign on the bottle?—It “Keep away from the children”.
A:means; meaning
B:meaningful; meaning
C:meaning; means
D:means; mean
如图是小明家的部分电路,开始时各部分工作正常.他将电饭煲的插头插入三孔插座后,正烧水的电热壶突然停止工作,但电灯仍正常发光,拔出电饭煲的插头,电热壶仍不能工作,把试电笔分别插入插座的左、右孔,氖管均发光.若电路中只有一处故障,则( )
在某个变化过程中,数值保持不变的量,叫做( )
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