除氧器一般设计有()保护和()保护。
开孔打钻过程中的注意事项是什么?
下列典故说法正确的是()。 ["“刮目相看”出自《三国志》","“草木皆兵”说的是淝水之战","“亡戟得矛”选自《吕氏春秋》","“望梅止渴”的主人翁是项羽"]
鱼骨图中分析要因后,选取重要要因时,应该是() ["大骨","中骨","小骨","随意"]
Fuel scarcities and price increases()automobile designers to develop completely new lines of small cars and trucks. ["prompted","persuaded","imposed","enlightened"]
在高压锅炉的升压过程中,一般情况下,汽鼓壁上下温差不得超过()。