【单选题】某女病人因全身关节痛,面部有蝶形斑,查血抗Sm抗体(+),确诊为系统性红斑狼疮,医嘱避免目光照射,病室紫外线消毒时应回避,外出穿长袖上衣和长裤,戴帽或撑伞遮阳。原因是( )
【单选题】An increase in diesel engine crankcase pressure generally indicates excessive()
B.
lube oil header pressure
【单选题】A generally circular low pressure area is called a{n} ( ).
【单选题】某女病人因全身关节痛,面有蝶形红斑,查血抗Sm抗体(牛),确诊为系统性红斑狼疮,医嘱避免日光直射,病室紫外线消毒时应回避,外出穿长袖上衣及长裤,戴帽或撑伞遮阳。原因是
【单选题】An increase in crankcase pressure generally indicates()
A.
worn connecting rod bearings
B.
worn engine cylinder liners
C.
high cylinder firing pressure
D.
stuck spring-loaded manhole covers
【判断题】三相异步电动机的正反转控制中,互锁是为了正反转的切换
【单选题】精馏塔中由塔顶往下的第n-1、n、n+1层理论板,其气相组成关系为