当换热器的管内介质为高温高压介质时，其管子与管板的连接适宜采用（）方法。
A、胶连接
B、胀焊连接
C、焊接
D、胀接
参考答案：B
.
The President said to the public, “________ hoped that people in the area will recover from the terrible earth quake soon.”
A．This is
B．There is
C．That is
D．It is
临产的标志是什么
