Which of the following statements describes the function of an air compressor intake filter?()
A. Protects against suction valve float
B. Provides a positive pressure on the air inlet valves
C. Prevents lubricating oil contamination of the compressed air supply
D. Protects against the damaging effects of airborne solid particle
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()千伏及以下接入用户侧分布式电源项目,不要求具备低电压穿越能力。
A. 0.38
B. 10
C. 35
D. 110
统计资料表明,烧结矿的FeO波动降低1%,高炉焦比降低1%~1.5%,产量增加1%~1.5%。
A. 正确
B. 错误
预缩砂浆修补在铺填预缩砂浆之机先涂一层厚1cm的水泥浆,其水灰比为0.45~0.50。
A. 正确
B. 错误