制冷剂在蒸发器中吸收被冷却物的热量，所以是低压高温气体。（）
参考答案：错
I _______ my aunt in Australia this winter vacation.[ ]
A. visit
B. am going to visit
C. visited
D. was going to visit
XT3307型水车的最大行驶速度为？
