如图所示,一个带负电的物体从粗糙斜面顶端滑到斜面底端时的速度为v,若加上一个垂直纸面向外的磁场,则滑到底端时
A.v变大
B.v变小
C.v不变
D.不能确定
答案:B
–Try not to work yourself too hard. Take it easy.
–Thanks. _______.
A.No way
B.So what?
C.You too
D.What for?
下列哪种不是特殊CT造影增强法()
A.脑池造影CT
B.脑室造影CT
C.肝脏造影CT
D.关节造影CT
E.脊髓造影CT