司机提高司控器手柄位时，调速器补偿活塞移动方向是（）。
A.下降
B.上升
C.不动
D.由柱塞位置确定
参考答案：B
The Smiths don't usually like staying at ________ hotels，but last summer they spent a few days at a very nice hotel by ________ sea.
A．/；a
B．the；the
C．/；the
D．the；a
供暖系统的设计热负荷
