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对曲柄摇杆机构，当以曲柄为原动件且行程速度变化系数k时，机构就具有急回特性。
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压力角与传动角的关系是压力角+传动角= 。
Directions: Complete the following passage with words chosen from this unit. The initial letter of each is given.How can students do well at school? Are straight-A students always those who are the brightest? Students are very interested in getting answers to questions like these as achieving 1) a_________ excellence is, and will always be, one of their top priorities at school. A professor of education who has recently 2) c__________ a survey on the subject revealed that top grades do not always go the brightest students.When some basic 3) p__________ are followed, everyone can become a top student. To begin with, study should always be the number one 4) p__________ for a student. Study time is always guaranteed and should never be 5) c____________ for personal recreation such as movies, TV programs or snacks. In 6) a___________, learning to be organized is very important. Keeping everything in its place and filling class notes in order are two good examples. 7) S__________ up in class and asking questions is another winning 8) f_________. A student can clarify any doubts by asking questions. 9) P_____________ in group study in another help. By framing tentative test questions based on class notes, students can help each other prepare for tests. Last but not least, always hand in neat work. A student who turns in neat work is already on the way to scoring an A.A student may suffer from different kinds of 10) p_________ at school, but if he follows these principles in his studies, sooner or later he will become a top student.
1935年12月瓦窑堡会议明确提出了党的基本策略任务是（）。
为了争取中国共产党在抗日战争中的领导权，党在抗日民族统一战线中必须坚持（）。
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