锅炉的保养主要宗旨要使锅炉的（）和压力变化平衡。
参考答案：温度
You know Cartoon World is on TV _________ 6:30 p.m. _________ 7:00 p.m. [ ]
A. from; to
B. between; to
C. from; and
D. at; at
埋深大于( )的称为深基础。
A．4m B．5mC．6m D．5.5m
