数字电压表因有采样与量化的过程,所以测量速度要比模拟式电压表慢得多。()
参考答案:错
30.We don’t allow____here,but we can allow you ____in the next room.
A.smoking,smoke
B.smoke,smoking
C.smoking,to smoke
D.smoke,to smoke
已知区域Ω={(x,y)|x+y≤10,x≥0,y≥0},A={(x,y)|x-y≥0,x≤5,y≥0},若向区域Ω内随机投1个点,则这个点落入区域A的概率P(A)=( )。