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在流式细胞技术的检测时,对于B淋巴细胞亚群分析，应选用几色光？
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每种荧光染料都有特定的激发波长,下面叙述正确的是
用于流式细胞技术分析的细胞必须符合的基本条件是
[音频]This is the VOA Special English Education Report.Twenty-five-year-old Rick Aggeler says he discovered early in life that music is (1)______.RICK AGGELER: "Music made me feel like anything was(2)______."At the age of seven, a medical condition (3)_____him to have a brain operation. It also prevented him from playing sports. So his mother suggested that he learn to play(4)______instead.RICK AGGELER: "I started playing drums with Ronit Glick. She was my elementary teacher. I remember just the(5)_____it brought to me. It was my favorite thing. Sixth grade was a new school to me and I had a (6)______time kind of getting along with all the kids. And Ms. Glick just took me in and I had so much fun at the (7)______. It just felt great all the time."Rick Aggeler graduated from the Berklee College of Music in Boston, Massachusetts, in two thousand seven. While there, he (8)_______as a music teacher at a youth center in the Dorchester neighborhood of Boston.He helped (9)______a small music club within the center. The Music Clubhouse at the Blue Hill Boys and Girls Club quickly grew.Young people come to the Music Clubhouse after school and during summer break. The club provides a safe environment to learn to play (10)______and to perform together in bands. The club even has its own recording studio.(MUSIC-"Super Hero")The club has released two (11)_______. "Super Hero" is one of the songs from the second album, "Because of You."Fourteen-year-old Javon Martin performs under the name Yung Fresh. He joined the Music Clubhouse three years ago.YUNG FRESH: "It has (12)_____my life in a big way because I never thought I would be doing this. We now give shows. I'm on the radio. People are actually starting to see me as like an (13)_______."(MUSIC: "Blue Hill Shuffle")Ten-year-old Akheylah Hunter joined the club last year but did not play an instrument. Now, she plays piano and sings in a band. What she likes best, she says, is(14)_____.AKHEYLAH HUNTER: "We performed in different places like at Berklee College of Music. We go on trips, like we went to the House of Blues and we went on stage and we performed, and it was very(15)_____."The Music Clubhouse opened three years ago and has served almost five hundred young people. Rick Aggeler says preparing and performing is good for them.RICK AGGELER: "I can see what it does for them, and it just develops (16)______. It's also an escape. A big problem we have in the neighborhood is obviously gangs, and family dynamics. And we have a lot of (17)_____. We can have those conversations and then they can write, too. They can rap about it and kind of let it out a little bit."(MUSIC-"Wake Up")Rick Aggeler says he is happy but not (18)______by the results of the Music Clubhouse at the Blue Hill Boys and Girls Club.RICK AGGELER: "As much fun as I do have drumming and performing live, it's definitely more(19)______and more fun, watching these kids grow up and (20)_____."And that's the VOA Special English Education Report. I'm Steve Ember.
生精小管的切面中最不易见到的生精细胞是（）
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