电流互感器的二次侧允许开路运行。()
120控制阀为加速缓解作用而设的缩孔是() ["A、缩孔Ⅰ","B、缩孔Ⅱ","C、缩孔Ⅲ","D、缩孔Ⅳ"]
103型、104型分配阀充气时,工作风缸充气过慢原因是()。 ["A、主活塞漏泄","B、充气孔过大","C、滑阀充气孔堵塞","D、滑阀充气孔过小"]
碳溶于()的γ—Fe中所形成的组织称为奥氏体 ["金属晶体","密排立方晶格","面心立方晶格","体心立方晶格"]
减少焊接残余应力的措施不正确的是() ["采取反变形","先焊收缩较小焊缝","锤击焊缝","对构件预热"]
HL240—LJ—250