同样重要的是确保这些动作出现在合适的场合。

Equally important is ensuring that these movements appear in the correct context.

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中性介质，也宜选用铜合金为阀壳材料的电磁阀，否则，阀壳中常有锈屑脱落，尤其是动作不频繁的场合。

Neutral medium, it should be chosen for the copper alloy shell material valve solenoid valve, or valve shells falling debris often rust, especially the movements do not frequent occasions.

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机械驱动式机械手臂只用于动作固定的场合。

Mechanically driven mechanical arm for use only in fixed position.

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