由于I1=I2可知：它们所产生的电磁感应强度大小相等，方向相反(I1电流产生的磁感应强度方向与x轴方向相反，I……

单项选择题谁的《母育学校》是世界教育史上第一本幼儿教育专著?()

单项选择题A.B.C.D.

单项选择题You need to modify a client application that consumes a Windows Communication Foundation (WCF) servicE.The service metadata is no longer availablE.You need to modify the previously generated proxy to include asynchronous calls to the servicE.What should you do? （）A.Update the service reference with the Generate asynchronous operations option.B.Create a partial class for the previously generated proxy and include the new asynchronous methods.C.Create a class with the same name as the previously generated proxy and add the new asynchronous methods. Add the new class to a namespace that is different from the original proxy.D.Create a class with the same name as the previously generated proxy and add the new asynchronous methods as partial methods. Add the new class to a namespace that is different from the original proxy.

单项选择题_____los días se levanta a las nueve de la mañana.

单项选择题A.B.C.D.

单项选择题()是土地革命时期，革命根据地学前教育的指导性、纲领性文件。

单项选择题A.4.34B.4.25C.4.47D.4.00

单项选择题上、下呼吸道以 为界A. 鼻后孔B. 咽峡C. 喉D. 气管E. 主支气管

单项选择题A.等于120VB.等于4.8VC.等于0.6VD.无法计算

单项选择题患者，食少乏力3个月。由于过度劳累而致头晕乏力、纳呆食少、胸胁胀满、腹痛泄泻。证属 A、肝气乘脾 B、肝气犯胃 C、脾虚肝乘 D、胃弱肝乘