洁身自好,遵守性道德,提倡安全性行为属于性病干预策略的()。 ["一级预防","二级预防","三级预防","原级预防","综合预防"]
急性肠梗阻,大量呕吐,脉搏细弱,血压下降() ["低渗性脱水","等渗性脱水","高渗性脱水","水过多","原发性脱水"]
弱磁场磁选机的磁场强度为()T。 ["A、<0.25","B、>0.6","C、以上都是","D、0.26~0.6"]
动员糖尿病患者坚持按医嘱服药,属于()。 ["原级预防","一级预防","二级预防","三级预防","四级预防"]
重介旋流器实际分选密度与入料介质密度的关系是()。 ["A、实际分选密度大于入料介质密度","B、关系不确定","C、实际分选密度等于入料介质密度","D、实际分选密度小于入料介质密度"]
道岔转辙器及尖轨安装应符合那些規定?