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落砂机的振动源分为机械﹑电磁和气动。 。
The vibration source of the falling sand machine is divided into mechanical, electromagnetic and pneumatic.
youdao
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落砂机的振动源分为机械﹑电磁和气动。 。
The vibration source of the falling sand machine is divided into mechanical, electromagnetic and pneumatic.
youdao