对低压容器来说,气压试验的试验压力是工作压力的() ["1.15倍","1.2倍","1.25倍~1.5倍","1.15倍~1.2倍"]
在画者与被画物之间,假设的一个与视线垂直的透明平面称为()。 ["A、透明画面","B、画面","C、物面","D、透明物面"]
白铜是由()合成。 ["A、铜和铝","B、铜和硅","C、铜和锌","D、铜和镍"]
()最适宜采用退火。 ["A、高碳钢","B、低碳钢","C、为了降低成本","D、力学性能要求较低的零件"]
用于制造渗碳零件的钢称为() ["结构钢","合金钢","渗碳钢","工具钢"]
压力管道临界外压力