【单选题】有人在轿厢作业,如需要移动轿厢时,必须保证电梯处于( )。
【单选题】“要接纳别人,发现别人长处,欣赏别人,对别人拥有爱心”,这句话告诉我们要善于()
【简答题】题7.21图所示为低通滤波器,放大器是理想的,为使系统稳定,K应满足什么条件?
【简答题】已知反应CaCO 3 (s)====(s)+CO 2 (g),试判断298K和1500K温度下正反应是否能自发进行,并求其转变温度?
【单选题】What does the man mean?
A.
The woman can buy those things.
B.
The woman shouldn't buy those things.
C.
The woman can't afford those things.
【简答题】who does the woman want to buy the hat for ?
【简答题】What will the man and the woman buy for Julia?
【单选题】已知平壁厚0.02m,热阻为0.02m2.K/W,其导热系数为