1) order 4n
4n阶
1.
A method for constructing a magic square with order 4n;
4n阶幻方的一种构造方法
2.
A method of constructing magic squares of order 4N;
4N阶幻方构造方法的论证
3.
Discovery of a method of constructing magic cubes of order 4N;
种4N阶幻立方构造方法的发现
2) nonlinear 4 n th order differential equation
非线性4n阶常微分方程
3) thorium family
4n系
4) 4N purity indium
4N精铟
5) 21-4N steel
21-4N钢
1.
Influence of different rare earth amounts on microstructure and mechanical properties of 21-4N steel was studied.
结果表明:适量混合稀土加入后,21-4N钢铸态树枝晶组织明显得到细化,偏析现象减轻,夹杂物尺寸变小,部分夹杂物形态由多边形向椭圆形转变。
6) γ'-(Fe_(1-x)Ni_x)_4N
γ'-(Fe1-xNix)4N
补充资料：无阶
1.谓没有门径。
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