| Despite the fact that today viruses
(病毒) are known to cause cancer in animals and in certain plants, there exists a
great reluctance to accept viruses as being of importance in human cancer. Basic
biological phenomena generally do not differ strikingly as one goes from one
species to another. It should be recognized that cancer is a biological problem
and not a problem that is unique for man. Cancer originates when a normal cell
suddenly becomes a cancer cell which multiplies widely and without apparent
restraint. Cancer may originate in many different kinds of cell, but the cancer
cell usually continues to carry certain traits (特性) of the cell of origin. The
transformation of a normal cell into a cancer cell may have more than one kind
of cause, but them is good reason to consider the relationships that exist
between viruses and A. they are innocuous agencies B. they are the causative agents of most human cancer C. they seem to be infections to many people D. they are generally thought to be relevant to most cancer in man [判断题]反渗透系统包括5μm保安过滤器，两级反渗透膜组、清洗系统及控制仪表四部分
A.正确 B.错误 [单选题]关于梭形关节的叙述,下列哪项是错误的?( )
A.为指间关节增生、肿胀呈梭形畸形 B.为非对称性病变 C.早期局部有红肿及疼痛 D.晚期明显强直,活动受限,手腕及手指向尺侧偏斜 E.见于类风湿性关节炎 [简答题]什么叫段管线？
[判断题]举高.照明消防车必须停靠在空中无障碍物.地面平坦坚实的地段，升降作业时要与架空高压线路保持一定的安全距离。( ) (中)
A.正确 B.错误 [简答题]旋风分离器工作原理。
[单项选择]对于采用软件工程方法设计的软件，其维护工作应始于______ 。
A. 回归测试 B. 阅读代码 C. 阅读设计文档 D. 需求分析 [判断题]列车运行,原则上以开往北京方向为上行,反之为下行。
A.正确 B.错误 [判断题]10kV箱式变电站DW型空气断路器的维护，如发现灭弧栅片烧损严重或灭弧罩碎裂，可将其除去继续使用（ ）。
A.正确 B.错误 [单选题]设曲线y=ln(1+x2)，M是曲线上的点，若曲线在M点的切线平行于已知直线y-x+1=0，则点M的坐标是( )。
A.(-2，ln5) B.(-1，ln2) C.(1，ln2) D.(2，ln5) [多选题]区分国际战略格局的不同类型，主要要依据格局的( )
A.内部结构 B.地理环境 C.军事对比 D.外在形态 [单选题]梁端伸缩装置组成不包括( )。
A.固定钢枕 B.活动钢枕 C.防水橡胶条 D.侧向支座 [单项选择]建设工程项目质量控制系统运行机制不包括( )。
A. 反馈机制 B. 动力机制 C. 激励机制 D. 约束机制 [单选题]SS4B型电力机车摩擦减振器的摩擦片厚度原型为( )mm。
A.3 B.4 C.5 D.6 [单选题]CSC-101A装置报文显示“定值出错”处理方法为(____)。
A.固化定值，否则更换CPU插件 B.切换定值区 C.进行一次软压板投退 D.进入出厂调试菜单进行设置 [填空题]去甲肾上腺素为______构型，具______旋性。
[简答题]指出OPAR1611单板命名的含意。
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