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【单选题】如图所示,匀强电场的电场强度方向与水平方向夹角为30°且斜向右上方,匀强磁场的方向垂直于纸面(图中未画出).一质量为m、电荷量为q的带电小球(可视为质点)以与水平方向成30°角斜向左上方的速度v做匀速直线运动,重力加速度为g,则( )
A.
匀强磁场的方向可能垂直于纸面向外
B.
小球一定带正电荷
C.
电场强度大小为
D.
磁感应强度的大小为
【简答题】完形填空。 Bob is 1 American boy. He studies in a high school in Washington. He is four years old and he is in Grade 8 now. Bob wa s born 2 1984 in New York. He started school at th e age of six. He st...
【简答题】Bob is 1 American boy. He studies in a high school in Washington. He is four years old and he is in Grade 8 now. Bob was born 2 1984 in New York. He started school at the age of six. He studied in...
【多选题】类型一、 与电场有关的平衡问题 如图所示,在一电场强度沿纸面方向的匀强电场中.用一绝缘细线系一带电小球,小球的质量为 m ,电荷量为 q ,为了保证当细线与竖直方向的夹角为 60度 时,小球处于平衡状态,则匀强电场的场强大小可能为( )
A.
B.
C.
【简答题】《西方的没落》写作时间是（）
【简答题】B Mr. Smith is from New York. He is in China for about 8 years. He teaches us English. His English classes are very interesting. We all like his classes very much. Mr. Smith has two children—Scott and...
【单选题】血型分二类,一类与人相同,如 A、B、O和Rh型,另一类是该属动物特有的如Arh、Crh、Drh,这类血型抗原能产生同族免疫,且不会发生新生仔溶血的动物是
A.
兔
B.
狗
C.
猫
D.
猴
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