“一山有四季”的形成原因是（ ） A．地形因素 B．纬度因素 C．海陆因素 D．

痰火子烦，治宜______，方用______去防风，加______。

The reason why I gave in is ____ if I didn’t.

A．because she would be disappointed

B．that she would be disappointed

C．because she would have a disappointment

D．for she would be disappointed

控制器（）两者统称为中央处理器。

A、存诸器；

B、显示器：

C、调制解调器

D、运算器。

锅炉运行时为什么要维持一定的负压？