角膜干细胞位于()
A.角膜上皮细胞基底层
B.角膜缘部
C.角膜缘上皮细胞基底层内
D.穹隆部
参考答案:C
— Nobody can beat us.
— ______, I think Team One can beat you. [ ]
A. Yes
B. Tell you what
C. You're right
D. It doesn't matter
调节系统方框图中,与对象方框相连的信号是()。
A.给定值,操纵变量、干扰
B.操纵变量、干扰
C.干扰、被控变量
D.干扰、操纵变量、被控变量