A:whether he will finish the work on time
B:if he will finish the work on time
C:that he will finish the work on time
D:how he will finish the work on time
已知点M(a,b)(a>0,b>0)是圆C:x2+y2=1内任意一点,点P(x,y)是圆上任意一点,则ax+by﹣1的值( )
解释划线字的意思。
自非亭午夜分
①亭午
不见曦日
②曦
夏水襄陵
③襄