单选题 When analyzing the flash point of the sample, due to the loss of volatile components caused by the loose seal, the flash point result of the sample may ( ).
2024-07-16
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相关试题
单选题 Softening point of petroleum asphalt The height at which the steel ball sinks is ( ).
单选题 The higher the softening point of petroleum asphalt, ( ).
单选题 To measure the mechanical impurities of an oil whose 100 ℃ viscosity is less than 20 mm2/s, it is necessary to weigh the ( ) sample for experiment.
单选题 When measuring mechanical impurities in the oil product, dry the filter paper with precipitation in the oven for no less than 1 h, and then place it in the dryer to cool ( ).
单选题 The ( ) of petroleum asphalt has nothing to do with its softening point.
单选题 GB/ T511-88 "Method for Determination of Mechanical Impurities in Petroleum Products and Additives" the filter paper specification for use is ( ).
单选题 When measuring mechanical impurities in oil products, use the precision requirements of the analytical balance ( ).
单选题 The thermometer used to determine the softening point of asphalt has a measuring range of 30 to 180 ℃, and its minimum division value should be ( ).
