粘胶纤维断面形态特征为锯齿形，有（）。
参考答案：皮芯结构
– Would you mind my ______?
--_______. Do it as you like, please.
A．to play the piano, Good idea
B．playing the piano, Of course not
C．playing the piano, Of course
D．play the piano, All right
三盏灯“220V 100W”’、“220V 60W”、“220V 40W”都正常工作，其中最亮的是：[ ]
A．“220V 100W”
B．“220V 60W”
C．“220V 40W”
D．一样亮
