可调静叶调节机构主要由()四部分组成。
参考答案:静叶、曲柄、滑块、销轴
She is a quiet girl at school,but sometimes she _____ be very naughty.
A.should
B.would
C.can
D.will
支链氨基酸的英文缩写是()
A.BCAA
B.BEE
C.TPN
D.MCT
E.TNA