治疗三叉神经首选()
A.卡马西平
B.酰安咪嗪
C.布洛芬
D.氯丙嗪
E.阿托品
参考答案:B
解析:酰安咪嗪可以长期服用。而卡马西平不能作为治疗后的长期用药。
阅读短文,判断文后句子正(T)误(F)。
Yesterday was December twenty-third. I went to the department store to buy Christmas things with my
mother. We bought some lights, a tree and many gifts. Today, I help my father put the lights on our house.
Then we put up the Christmas tree. We put Christmas things on the tree and put the star on the top. We put
the gifts under the tree. Tomorrow is Christmas Day. I'm going to give my family gifts. My little sister, Cathy,
thinks Santa will bring us gifts. I don't think so.
( ) 1. Today is December 24th.
( ) 2. I bought Christmas things with my friends.
( ) 3. We put lights on the house at Christmas.
( ) 4. I'm going to give Cathy a gift.
( ) 5. Cathy doesn't think Santa will bring them gifts.
某同学在资料上查得弹簧振子的周期公式为T=2πmk,弹簧的弹性势能公式Ep=12kx2(式中k为弹簧的劲度系数,m为振子的质量,x为弹簧的形变量).为了验证弹簧的弹性势能公式,他设计了如图1所示的实验:轻弹簧的一端固定在非常平滑的木板一端,另一端连接一个质量为m的滑块,滑块上竖直固定一个挡光条,每当挡光条挡住从光源A发出的细光束时,传感器B因接收不到光线就产生一个电信号,输入电脑后经自动处理就能形成一个脉冲电压波形.开始时,滑块静止在平衡位置恰好能挡住细光束.给滑块一个瞬时冲量后,振子就振动起来.
(1)系统振动过程中,在电脑上所形成的脉冲电压波如图2所示,可知该系统的振动周期T=______.
(2)测得挡光条宽度为d,挡光时间△t,且△t远小于T0.则小球运动的最大动能Ek=______.
(3)如果再测出滑块振动的振幅为A,利用资料上提供的两个公式及测出的物理量表示出系统振动过程中弹簧的最大弹性势能Ep=______.
通过本实验,如果Ek=Ep,也就验证了弹簧的弹性势能公式的正确性.