问题
选择题
_____ there any bread or milk on the table? [ ]
A. Are
B. Is
C. Has
D. Have
答案
答案：B
搜题请搜索小程序“爱下问搜题”
_____ there any bread or milk on the table? [ ]
A. Are
B. Is
C. Has
D. Have
答案：B
。现将U形管的左端封闭，并让小车水平向右做匀加速直线运动，运动过程中U形管两管内水银面的高度差恰好为
。已知重力加速度为g，水银的密度为ρ，大气压强为p0=ρgl，环境温度保持不变，求