已知平面内三点A(2,-3),B(4,3),C(5,a)共线,则a=( )。
6
Never eat food that stays over night, it tastes .
A.if, good
B.but, well
C.even though, good
D.even if, well
什么是锻造温度范围?确定锻造温度范围的原则是什么?