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【单选题】
正常情况下，成人的肾小球滤过率为( )A.
100m1／min
B.
125ml／min
C.
250ml／min
D.
500ml／min
E.
1 000ml／min
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反馈参考答案：
举一反三
【单选题】如图所示,在一水平光滑绝缘塑料板上有一环形凹槽,有一带正电小球质量为m、电荷量为q,在槽内沿顺时针做匀速圆周运动,现加一竖直向上的均匀变化的匀强磁场,且B逐渐增加,则
A.
小球速度变大
B.
小球速度变小
C.
小球速度不变
D.
以上三种情况都有可能
【单选题】如图所示,两条不等长的细线一端固定在同一点,另一端分别拴两个带同种电荷的小球,两小球所带的电荷量分别为q1、q2,质量分别为m1、m2,当两小球静止时恰好处于同一水平线上,且α>β,则造成α>β的原因是 ( )
A.
m1
B.
m1>m2
C.
q1
D.
q1>q2
【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...
【简答题】《西方的没落》写作时间是（）
【简答题】Alice is______girl. A. an eleven-year-old B. a eleven-years-old C. a eleven-year-old D. an eleven-years-old 7. John is fatter tha...
【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...
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