“对流”一节在引入新课时,是引导学生能推想到(?)存在着一种新的热传递方式.教材引入时,在上节图2-14的演示实验中[见图1(a)],将火焰移至试管底部加热,试管上部的水很快会热起来,在上节图2-15的演示实验中[见图1(b)],将试管口斜向上,对试管底加热很快手指 The “convection” section introduced new classes to guide students in thinking that there is a new type of heat transfer. When the teaching materials are introduced, they are shown in the demonstration experiment in Figure 2-14 of the previous section [see Figure 1]. (a)], the flame is moved to the bottom of the tube and the water in the upper part of the tube heats up quickly. In the demonstration experiment in Figure 2-15 (see Figure 1(b)), the tube mouth is diagonally upward. The bottom of the tube is heated quickly