库存控制中经常以()作为库存控制目标。
()依据其操作强化原理设计和制造了一种教学机器,该机器是一种台式机机械装置,内置一教学程序。 ["赫尔","皮亚杰","梅耶","斯金纳"]
The main purpose of starting the diesel engine on air briefly is() ["to inspect if the cylinder has the water leakage","to expel out the residual water\/gas\/oil from the cylinder","to check if fuel supply is normal","A and B"]
()认为,心理学的研究对象是“别人”,心理学是研究别人的科学,主张抛弃把心理学看作为主要研究自己的传统看法。 ["巴甫洛夫","铁钦","冯特","梅耶"]
有交往的进程一定()某些资源。
有一台三角形接线的三相异步电动机,满载时每相电阻R=9.8Ω,电抗XL=5.3Ω,并用线电压380V的三相电源供电,求电动机的相电流和线电流?