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【单选题】
Situation: One Saturday morning, Magid was home and didn't have much to do. He thought about his friend, Jim, who he used to work with. It was a long time since they had seen each other and Magid felt bad about this. He had told Jim that he would come and visit him sometime, but several months had passed and he just couldn't find the time. He remembered that Jim had told him,“Come and visit when you get the chance. I want to stay in touch with you." This Saturday morning seemed like a good time to visit. He went to Jim's house and rang the dobell., When Jim answered the door, he didn't lo completely happy to see Magid. Then, afer afew seconds, he smiled and said, "Hi, Magid. Come on in." How do you think Magid felt?A.
Magid was probably offended.
B.
Magid udersod ha Jim wanted to be by himsef that day.
C.
Magid understood that Jim was a little bit upset because he dropped by without calling first.
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【多选题】以下关于除 CO2 灭火系统外的其他灭火系统设计说法,正确的是
A.
有爆炸危险的气体、液体类火灾的防护区，应采用惰化设计浓度
B.
无爆炸危险的气体、液体类火灾和固体类火灾的防护区，应采用灭火设计浓度。
C.
几种可燃物共存或混合时，灭火设计浓度或惰化设计浓度，应按其中最大的灭火设计浓 度或惰化设计浓度确定。
D.
两个或两个以上的防护区采用组合分配系统时，一个组合分配系统所保护的防护区不应 超过 5 个
【单选题】经过两直线 2 x - 3 y - 3 = 0 和 x + y + 2 = 0 的交点且与直线 3 x + y - 1 = 0 垂直的直线 l 的方程为( )
A.
5 x + 15 y － 18 ＝ 0
B.
5 x － 15 y － 18 ＝ 0
C.
15 x － 5 y － 18 ＝ 0
D.
15 x + 5 y － 18 ＝ 0
【简答题】如图15，在Rt△ABC中， ，CP平分∠ACB，CP与AB交于点D，且 PA=PB． 小题1:请你过点P分别向AC、BC作垂线，垂足分别为点E、F，并判断四边形PECF的形状 小题2:求证：△PAB为等腰直角三角形 小题3:设 ， ，试用 、 的代数式表示 的周长； 小题4:试探索当边AC、BC的长度变化时， 的值是否发生变化，若不变，请直接写出这个不变的值，若变化，试说明理由
【单选题】猪带绦虫病在治疗前的确诊依据是查到A.头节B.囊虫C.虫卵D.六钩蚴###
A.
猪带绦虫病在治疗前的确诊依据是查到 A.头节
B.
囊虫
C.
虫卵
D.
六钩蚴
E.
孕节
【简答题】设圆x2+y2+2x-15=0的圆心为A,直线l过点B（1，0）且与x轴不重合，l交圆A于C.D亮点，过B作AC的平行线交AD与点E. (1)证明|EA|+|EB|为定值，并写出点E的轨迹方程 (2)设点E的轨迹为曲线C1,直线l交c3于M,N两点，过B且与l垂直的直线与圆A交于P.Q两点，求四边形MPNQ面积的取值范围。
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