—Jack, please don't play the CD, or please ________. Father is sleeping.— OK. No problem.
A:turn it down
B:turn down it
C:turn it up
D:turn up it
如图所示,A、B为水平放置的间距d=0.2m的两块足够大的平行金属板,两板间有场强为E=0.1V/m、方向由B指向A的匀强电场.一喷枪从A、B板的中央点P向各个方向均匀地喷出初速度大小均为v0=10m/s的带电微粒.已知微粒的质量均为m=1.0×10﹣5kg、电荷量均为q=﹣1.0×10﹣3C,不计微粒间的相互作用及空气阻力的影响,取g=10m/s2.求:
If you keep driving so fast, you'll________in hospital sooner or later.
不等式x﹣2≤0的解集是( )