复制磷酸盐耐高温材料模型时,最佳粉液比例为()
A.100g:30ml
B.100g:13ml
C.100g:45ml
D.100g:5ml
E.100g:80ml
参考答案:B
This _____ my brother. ______ is my friend.
A.is, She
B.isn’t, He
C.isn’t, She
D.are, He
怎样排除发动机机油压力过高故障?