| {{B}}Questions 11-15{{/B}} Recent research has claimed that an excess of positive ions in the air can have an ill effect on people’s physical or psychological health. What are positive ions Well, the air is full of ions, electrically charged particles, and generally there is a rough balance between the positive and the negative charged. But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorm, earthquakes when winds such as the Mistral, Hamsin or Sharav are blowing in certain countries. Or it can be caused by a build-up of static electricity indoors from carpets or clothing made of man-made fibres, or from TV sets, duplicators or computer display screens. When a large number of positive ions are present in the air many people experience unpleasant effects such a A. They think they are insane. B. They feel rather bad-tempered and short-fused. C. They become violently sick. D. They are too tired to do anything. [单项选择]公式“＝SUM（A1：B2）”将要对（）求和。
A. A1，B2 B. A2，B1 C. A1，A2，B1 D. A1，A2，B1，B2 [判断题]气门响与工作循环的关系：跳火一次，发响一次。( )
A.正确 B.错误 [判断题]各班组安全教育的重点是三新人员和主要行车工种。
A.正确 B.错误 [单选题]( )混凝土结构子分部工程可划分为( )等分项工程
A.预应力 B.现浇结构 C.混凝土 D.砖砌体 E.装配式结构 [多选题]依据《中国南方电网有限责任公司电力安全工作规程》，电力线路是指在电力系统内用于输配电的（ ）和附件组成的设施。
A.杆塔 B.导线 C.避雷针 D.绝缘材料 [单选题]1.59 载运集装箱的车辆高度从地面起不得超过多少米?
A.5.5 B.5 C.4.5 D.4.2 [单选题](5分)判断题几乎所有的酿酒用葡萄都是以欧洲葡萄品种为基本种,长期改良获得,统称为欧洲葡萄。
A.)正确 B.)错误 [单选题]《普速旅客列车客运看车指导意见》:车下看车时,看车人数应根据客技站内停留车情况确定。车内看车时,看车总人数(不含行李、邮政车看车人员)由铁路局根据()合理确定,原则上不少于2人,不超过4人,车内有点火状态的燃煤炉灶时,可增加1~2名人员。
A. 班组人员 B. 列车状态 C. 客技站停留车 D. 列车编组 [单选题]早产儿呼吸系统的特点，下列描述错误的是:
A.呼吸中枢及呼吸器官发育不成熟 B.呼吸浅快不规则,易出现周期性呼吸及呼吸暂停或青紫 C.容易发生呼吸窘迫综合征即肺透明膜病 D.周期性呼吸及呼吸暂停发生率与胎龄呈正相关 E.易因高气道压力、高容量、高浓度氧以及炎性损伤而致支气管肺发育不良 [单项选择]药物及其转化通过肾小球膜，叫做（）。
A. 被动转运（简单扩散） B. 主动转运 C. 易化扩散 D. 滤过 [单选题]声门裂位于
A.两侧喉室之间 B.两侧声襞之间 C.两侧声韧带之间 D.两侧前庭襞之间 E.方形膜下缘 我来回答: 提交
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