达到某一温度时，其饱和蒸汽压与外界压力相等时，就会出现沸腾现象，此时的温度称为（）.
参考答案：沸点
We will have to overcome difficulties we might meet and finish the work ahead of time .
A．no matter how
B．no matter what
C．however
D．whatever
1mmHg=（）mmH2O。
