巴氏合金层的浇注
参考答案：在轴瓦上浇注合金层，通常有手工浇注或离心浇注的方法。
To save some of the human languages before they are forgotten, the students in our school started a discussion “Save Our ________”
A．Sky
B．Life
C．Arts
D．Voices
后天之本是（）
A.心
B.肝
C.脾
D.肺
E.肾
