一般碳素钢最高加热温度比铁碳相图中固相线低()以防过烧。
A.100~150℃
B.150~200℃
C.50~100℃
参考答案:C
“气血生化之源”是指()
A.心
B.肺
C.肝
D.脾
E.肾
Jim's father will go to space by spaceship. Which picture belongs to Jim's father?[ ]
A.
B.
C.
D.