下列选项中，允许进行现金交易的是（）。 ["活期存款","个人双整开户","单位定期开户","基本户销户"]
空压机起动前为什么要打开卸荷阀及放空阀？
下图中细胞器P的最重要的功能是：（） ["合成蛋白质","利用异化作用所产生的能量合成ATP","利用日光能合成ATP","转运蛋白质"]
Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （） ["increasing the quantity of starting air","increasing the lube oil pressure","heating the engine fuel supply","heating the engine coolant"]
霍尔效应的原因是（） ["电流在磁场中受到洛仑兹力","霍尔元件在磁场中感生出电动势","霍尔元件在磁场中受到哥氏力","霍尔元件在磁场中受到重力"]
配电自动化终端的作用是什么？
