食物可以接触的最高温度是()
A.水温
B.油温
C.火温
D.气温
参考答案:B
Peterson used to work in a remote mountain village school, which is only _____ on foot.
A.reliable
B.accessible
C.available
D.convenient
论述钻铸铁材料时钻头主切削刃容易烧损的额原因。