Most of the animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership which is good for both of them. You may see some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in the parasites (寄生虫) on sheep. The sheep allow the birds to do so because they move the cause of discomfort. So although they can live without each other, they do better together.
Sometimes an animal has a plant partner. The relationship develops until the two partners can- not live without each other. This is so in the corals (珊瑚) of the sea. In their skins there are tiny plants which act as "dustmen", taking some of the waste products from the corals and giving in re- turn oxygen (氧气) which the animal needs to breathe. If the plants are killed, or are even prevented from receiving light so that they cannot live normally,
A. birds and parasites
B. birds and sheep
C. parasites and sheep
D. sheep, birds and parasites
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A.正确 B.错误 [单选题]感染后获得传染免疫的细菌是( )
A. 脑膜炎奈瑟菌 B. 结核分枝杆菌 C. 霍乱弧菌 D. 伤寒沙门菌 [判断题]所有电气设备的外壳均应清洁无油垢，工作接地及保护接地良好。
A.正确 B.错误 [单项选择]某纳税人由于计算错误，造成少缴税款累计8万元，则税务机关可以对其进行的处理是( )。
A. 在3年内要求其补缴税款，但不得加收滞纳金 B. 在3年内要求其补缴税款和滞纳金 C. 在5年内要求其补缴税款和滞纳金 D. 无限期追征滞纳金、罚款 [多项选择]构建员工素质测评标准体系包括( )等。
A. 员工素质测评的基本原理 B. 员工素质测评的类型 C. 员工素质测评的主要原则 D. 素质测评标准体系 E. 员工素质测评量化的主要形式 [判断题]《辽宁省农村信用社反洗钱工作档案管理办法》规定了反洗钱工作资料的管理，也包含客户身份识别、客户身份资料及交易记录等反洗钱工作信息资料的保存管理
A.正确 B.错误 [单选题]在基坑支护中,下列哪一项措施未达标将直接判定为不合格( )。
A.人工开挖的狭窄基槽,开挖深度较大或存在边坡塌方危险采取支护措施 B.自然放坡的坡率符合专项施工方案和规范要求 C.支护结构水平位移达到设计报警值未采取有效控制措施 D.基坑支护结构符合设计要求 [多选题]带电作业工作票签发人和工作负责人、专责监护人应由具有（）的人员担任
A.带电作业资格 B.高级工程师资格 C.带电作业实践经验 D.技师资格 [简答题]道岔木枕的面宽是( )mm。
[多选题]下列情况，属于正当防卫的是（ ）。
A.杀人犯正要持枪杀人时，被害人顺手拣起砖头砸向杀人犯，将其打成重伤 B.强奸犯正在对妇女实施暴力欲强奸时，行人路过将强奸犯打伤 C.抢劫犯正持刀威胁被害人，被过路群众用石头砸伤头部 D.在制服抢劫犯的过程中，将其打成轻伤 [单项选择]胃内主要分泌胃蛋白酶的细胞是（）
A. 主细胞 B. 壁细胞 C. 黏液细胞 D. G细胞 E. 嗜银细胞 [多选题](多选题)、属于以上事件的间接原因有( )。
A.对现场不熟悉 B.单人工作缺少监护 C.现场作业风险分析辨识不足 D.工作人员配置不合理 [填空题]用来描述计算机每秒钟所能执行的指令条数的一个重要的计算机性能评测指标是 ______。
[简答题]简述非常站控与 CTC 之间的模式转换条件及操作方式。
[单选题] 在完全竞争市场和不完全竞争市场中,厂商在哪种情况下将增加产量 ( )。
A.MR﹤MC; B. MR﹥MC; C. P﹤MC; D. P﹥MC 我来回答: 提交
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