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问题:

[单选] Cargo booms must be weight tested to recertify the Safe Working Load (SWL) every().

A . year
B . two years
C . four years
D . five year

模糊控制器是由模糊化接口、()、推理机和清晰化接口组成。 How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?() clean the fittings before they are disconnected。 Place drip pans under leaky fittings。 Seal any cracks in lines with Permatex。 Coat all threads with graphite oil。 20千伏配电网线路单相接地与10千伏相比有何区别?为什么要加装零序电流保护? 变电站20千伏接地变零序过流保护动作原因有哪些? 衡量振铃现象的参数是()。 Cargo booms must be weight tested to recertify the Safe Working Load (SWL) every().
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