锅炉水质应定期化验,炉内部的pH值应在()之间。 ["5~6","8~9","9~10","10~12"]
南豆腐因其含水量的原因,就其他质地特征,又叫它() ["硬豆腐","软豆腐","老豆腐","嫩豆腐"]
曳引轮轮槽磨损操底至钢丝绳间隙>() ["0.5","1","1.5","2"]
我国豆腐品种有北豆腐和南豆腐,它的区别之一是() ["榨时间不同","原料不同","成分不同","颜色不同"]
在蒸汽加热器内,蒸汽冷凝有汽相变为(),()热量。 ["液相,吸收","液相,放出","固相,放出","固相,吸收"]
丝锥是加工()的工具,有()丝锥和()丝锥。