A:表皮、叶肉、叶脉
B:叶柄、叶片
C:叶柄、叶片、叶脉
D:叶片、叶肉、叶柄
若sin(π6-α)=13,求cos(2π3-α)的值.
My sister likes playing the guitar, but she can't play ______.
阅读材料,运用所学知识,回答下列问题: