开炉点火后要不断用钎子通开塞堵铁口的焦炭,目的是()。 ["防止炉内压力升高","利于炉况顺行","喷吹铁口加热炉缸","不利于还原"]
塑料()老化后,会出现发粘起泡、变硬、变脆、龟裂剥离、变形、变色等现象。 ["外观","电性能","机械性能","物理性能"]
能除去60~90WM灰尘的除尘设备称为()。 ["精细除尘器","粗除尘器","半精细除尘器","细除尘器"]
双层底结构船舶可提高船舶的()。 ["抗沉性","稳性","航海性能"]
ZXMP S200设备支持的2M个数是:(). ["16,32","6,21","8,21","8,24"]
说明静电有哪些危害?