S.D.I.C. chlorine Granular packed into 50kg plastic drum inner two-layers plastic bags,total one twenty foot container 420 drums net weight 21000kg，S.D.I.C Powder,Granular same on.
Export to Egypt,South Africa,Turkey,Saudi Arabia,Mexico,Brazil and so on

WeChat +86 13863252992 ​​​ ​​​

T.C.C.A chlorine fizzy tablet 2g X5kg into tube packed into 5kg plastic drum inner two-layers plastic bags,total one twenty foot container 2500 drums net weight 12500kg
Export to Egypt,South Africa,Turkey,Saudi Arabia,Mexico,Brazil and so on

WeChat +86 13863252992 ​​​ ​​​

聆听音乐 2.2 instruments

the woodwind /the strings / the brass family
木管，弦乐，铜管乐器

french horn 法国圆号
trumpet 小号
bassoon 巴松
double reed 双簧
Viola 中提琴
low tuba 低音号
bass drum 低音鼓

弦乐演奏技巧
pizzicato 拨奏
vibrato 揉弦
tremolo 碎弓

多普勒效应
note 音符
key 调
scale 音阶
harmonic 泛音列
partials 泛音
tonic 主调音符
dominant 基音

dissonant 不和谐音
consonance 和谐音