单簧管的“二节”(或称“小筒”),是连接吹嘴和主管的一节短管,可起到调整音高的作用,但只能在较小的幅度內进行。若是遇到气溫变化较大,且同其它乐器合作时(如木琴、扬琴),要把音校准就特别难了。就是在同气溫条件下,如是寒冬腊月而又无暖气设备时,既使将小筒、吹嘴及主管的结合部分插到头,音还是偏低;而在盛夏之时,就是将其结合部分拔出很多,发音仍然偏 Clarinet “two” (or “small tube”), is connected to the nozzle and the main tube of a short tube, can play the role of pitch adjustment, but only in a small amplitude. If you experience a large temperature changes, and cooperation with other musical instruments (such as xylophone, dulcimer), to tone calibration is particularly difficult. Is the same temperature conditions, such as the winter and the twelfth lunar month without heating equipment, even if the small cylinder, blowing mouth and the competent part of the head inserted into the head, the sound is still low; but in midsummer, is the combination of its part Pull out a lot, the pronunciation is still partial