开关电源上的ADJ是什么意思?有人说是输出电压调整,可是它就是12V的直流电源,还调整什么啊?难道能调整到24V吗?

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• 开关电源上的ADJ是什么意思?有人说是输出电压调整,可是它就是12V的直流电源,还调整什么啊?难道能调整到24V吗?
• She is Sally.改为否定句,并作肯定回答.改为一般疑问句,并作否定回答
• 英语 and 并列句省略 The old worker insisted that he old ,and back to the working post again The old worker insisted that he wasn't old ,and be sent back to the working post again and 是that从句里的并列成分,它关联的应该是前面的insisted that ,这里and前后insisted 的用法不同 ,前者是坚持说,而后者是坚持要求,为虚拟语气.我意思是说 为何这句不是 The old worker insisted that he wasn't old ,and insisted that he be sent back to the working post again 省略句不是针对 be 动词和相同主语间么,省略句有哪些形式呢?