饱和温度与压力有关,压力越高,饱和蒸汽温度()。 ["越低","不一定","不变","越高"]
密闭式热水器比半密闭式热水器安全系数更()。 ["高","低","一样","无法比较"]
安全域划分的根本原则包括() ["生命周期原则","业务保障原则","结构简化原则","等级保护原则"]
SDS法测定血红蛋白的缺点有() ["缺乏参考品","血红蛋白转化慢","SDS纯度差","破坏白细胞","HbCO转化慢"]
客车蓄电池箱与车体间的绝缘电阻值应大于() ["20kΩ","80kt","0.5MΩ","1M&Omega"]
建国后某年开始,由哪些单位联合进行了集中编目?