通过数值模拟和分析得出，较大的磁感应强度造成凝固界面前沿附近金属熔体重力倍数过低是在管坯中产生缩松的原因。
Through simulation and analysis, it is educed that the shrinkage in tube billet results from too low gravitation multiple near liquid-solid interfaces by intensive magnetic field.
电流保护的构成元件有电磁感应型，晶体管型，微型机。
The constituted elements of the current protective device have three type:electromagnetic, transistor and also microcomputer.
加热器，由电磁感应线圈缠绕金属管构成。
The heater is constituted by electromagnetic induction coil winding the metal pipes.
加热器，由电磁感应线圈缠绕金属管构成。
The heater is constituted by electromagnetic induction coil winding the metal pipes.
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