题干
—Shall we go for a drink at one o'clock this afternoon?
—________.Will two o'clock be OK?
A：Sure，it's up to you
B：Sure, no problem
C：Sorry, I can't make it
D：Sorry, I'm not available today
答案(点此获取答案解析）
C
g为重力加速度.人对电梯底部的压力为（ ）