______指学习者为了提高学习的效果和效率、有目的有意识地制定的有关学习过程的复杂的方案。
参考答案：学习策略
-Whose book is this?
-It _________ be Li Ping's because there is his name on it.[ ]
A. must
B. may
C. can't
D. could
进油节流调速回路比回油节流调速回路的速度平稳性好。
