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[单选题]在图8—8中所示的电场中()。 AA点的电场强度大于B点的电场强度 BA点的电势小于B点的电势 C负电荷在A点的电势能小于在B点的电势能 D把正电荷从B点移到A点时,电场力做功为正值 参考答案:C[单选题] 阻消耗的功率之比是下列答案中的哪一个()。 A1:1:1 B2:1:1 C1:2:2...[详细]
[单选题]()。 A BKOH C D 参考答案:D[单选题]静止在光滑水平面上的物体,在水平恒力作用下,经过时间t后获得动能Ek,若作用力的大小改变为F/2,而获得的动能仍为Ek则力作用的时间应为( ) A B C D 参考答案:C[单选题] 如图所示,S点为振源,其频率为100 H...[详细]
[单选题]实验室用固体NaOH配制一定浓度的溶液时,用不到的仪器是()。 A烧杯、量筒、玻璃棒 B托盘天平、胶头滴管 C容量瓶 D分液漏斗 参考答案:D[单选题]欲除去S02中混有的少量S03,应选用的吸收液是() ANaOH溶液 B水 C饱和Na2SO3溶液 D98%的浓硫酸 参考答案:D[问答题...[详细]
[单选题]Before writing your article,(),collect your material,and prepare an outline. Aa topic should be selected Ba topic to be selected Cyour topic should be s...[详细]
[单选题]As the journey was a long one,he took a friend with him for(). Apleasure Bentertainment Ccompany Ddefence 参考答案:C[单选题]As soon as she() open the letter,...[详细]
[单选题]It()him ten years to write that novel. Atook Bspent Ccost Dcosted 参考答案:A[单选题]We think of Mr.Li()our good friend. Ais Bto be Cas Dhas been 参考答案:C[...[详细]
[单选题]This lesson is()than the last one. Amore easier Bmore easy Cvery easier Dmuch easier 参考答案:D[单选题]George and Margaret and their children 21 at 140 Davis...[详细]
[单选题]If Mom looks out from the kitchen window,she______us playing in the yard。 Ais seeing Bwill see Cwas seeing Dhas seen 参考答案:B[单选题]My friends and I would...[详细]