Herfather
问题详情:
Her father____ in the USA for another years, so that she could work toward he master’s degree.
A. agreed he to stay B. permitted her stay C. let her staying D. approved of her staying
【回答】
D
知识点:动词
题型:选择题
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问题详情:在恒温、体积为2L的密闭容器中进行反应:2A(g)⇌3B(g)+C(g),若反应物在前20sA物质由3mol降为1.8mol,则前20s的平均反应速度为()A.v(B)=0.03mol/(L•s)B.v(B)=0.045mol/(L•s)C.v(C)=0.03mol/(L•s)D.v(C)=0.06mol/(L•s)【回答】考点:化学反应速率和化学计量数的关系.专题:化学反应速率专...
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在探究“光对鼠妇生活的影响”实验中属于变量的是( )A.温度 B.湿度 ...
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________hislessons,hefailedintheexam.A.Notreviewing B.H...
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