为什么压力、流量的调节一般不采用微分规律？
题型：问答题 简答题
问题：
为什么压力、流量的调节一般不采用微分规律？
题型：问答题 简答题
根据短文内容，将下面A—E五个句子分别填入文中空缺处，使补全后的短文意思通顺，结构完整。
Hip-hop dancing（街舞）is popular with many young people today. 小题1: They use this dance to show their love for life. It also shows that they feel good about life, that they just want to be themselves and enjoy life, 小题2:
Hip-hop dancing has a history of more than 20 years. 小题3: In early times, it was seen in New York and Los Angles. At that time, many young black people often danced to the music in the streets. They used their legs, arms, heads and even shoulders to dance. Many young people still use most of these moves today.
Hip-hop dancing became popular all over the world because of the 1983 movie Flashdance.
Some people performed Hip-hop dancing in the movie. 小题4: They began to dance like them. Then it became popular. 小题5: new school and old school. More and more young people are learning Hip-hop dancing. People believe that it is a good way to exercise their bodies, and that it is good for their health.
