Nature has devised many ways to protect
creatures’ eyes. The most common protection is the eyelid--a fold of skin that
closes over the eye, protecting it from damage. Eyelashes are useful for keeping
out dust and other irritants, and tears wash away any particles that get through
the other defenses. Some creatures, including most birds, have three eyelids. The upper and lower lids act like human lids and keep out twigs, dirt and sand. The third eyelid, however, is a semitransparent tissue that crosses over the eye from the inside corner to the outside corner. Because of this protective membrane, birds seldom have to blink. They close their eyes only when they go to sleep. In ducks, this third eyelid self as an underwater diving mask that helps the ducks find food. Most fish and snakes have no eyelids at all. Instead, a har A. tissue B. glass covering C. tiny brush D. diving mask [简答题]简述裂解气压缩机干气密封系统的作用及主密封气和二次密封气正常泄漏量大小是如何控制的?
[单选题]为咯血患者进行指导,下列哪项不符合要求( )。
A. 避免体位性低血压 B.指导患者合理饮食,补充营养 C.严禁屏气或剧烈咳嗽 D.保持大便通畅 [单项选择]郁证中的梅核气与噎膈的主要鉴别点是()
A. 患者的年龄与性别 B. 有无咽喉阻塞感 C. 有无吞咽困难 D. 有无咽干、灼热、咽痒 E. 有无长期吸烟饮酒史 [单项选择]下列哪一选项不属于行政诉讼的受案范围
A. 因某企业排污影响李某的鱼塘,李某要.求某环保局履行监督职责,遭拒绝后向法院起诉 B. 某市政府发出通知,要求非本地生产乳制品须经本市技术监督部门检验合格方可在本地销售,违者予以处罚。某外地乳制品企业对通知提起诉讼 C. 刘某与某公司签订房屋预售合同,某区房管局对此进行预售预购登记。后刘某了解到某公司向其销售的房屋系超出规划面积和预售面积房屋,遂以某区房管局违法办理登记为由提起诉讼 D. 《公司登记管理条例》规定.设立公司应当先向工商登记管理机关申请名称预先核准。张某对名称预先核准决定不服提起诉讼 [判断题]隔离开关可以 拉、合110kV及以下且电流不超过3A的空载变压器。
A.正确 B.错误 [判断题]固井注完水泥后,为防止水泥浆失重造成溢流,应关井侯凝。
A.正确 B.错误 [判断题]酱制菜的原料需先进行腌制及焯水或炸制处理。( )
[单选题]室内质控图中,警告线为
A.±1s B.±3s C.±4s D.±2s E.±5s [判断题]( ) S-MWD+伽马仪器进行实时测量数据时采用带通滤波器进行滤波。
A.正确 B.错误 [判断题]带电作业时,非特殊需要不应在跨越处下方或邻近有电力线路或其他弱电线路的档内进行带电架.拆线的工作。
A.正确 B.错误 [单选题]奶及其制品是⼈体( )的主要来源,成⼈每⼈每天应摄⼊奶 250~500g 左右。
A.蛋⽩质 B.磷 C.钙 D.铁 [单项选择]女性,24岁,心悸,面色苍白、巩膜轻度黄染,脾脏肋下2cm。血红蛋白80g/L,网织红细胞12%,如果患者为自身免疫性溶血性贫血可能出现的阳性试验是()。
A. 酸溶血试验阳性 B. Coombs试验阳性 C. 热溶血试验阳性 D. 蔗糖水试验阳性 E. 蛇毒因子溶血试验阳性 我来回答: 提交
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