对强制循环蒸发器而言，由于利用外部动力来克服循环阻力，形成循环的推动力大，故循环速度可达2～3m/s。
参考答案：对
一Is Jim playing video games.
一No, he's ________ his homework now. [ ]
A. forced to do
B. made do
C. forced doing
D. made doing
什么叫上市公司会计？上市公司会计的特点主要表现在哪些方面？
