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【简答题】
Charles Plumb was a US Navy jet fighter pilot in Viet Nam. After 75 missions, his plane was destroyed by a surface-to-air missile. Plumb parachuted down into enemy hands. He was captured and spent 6 years in a communist Vietnamese prison. One day, Plumb and his wife were sitting in a restaurant when a man from another table came up and said “You’re Plumb! You flew jet fighters in Viet Nam from the aircraft carrier Kitty Hawk. You were shot down!” “How in the world did you know that?” asked Plumb. “I packed your parachute,” the man replied. “I guess it worked”. Plumb assured him, “It sure did. If your chute(降落伞) hadn’t worked, I wouldn’t be here today.” Plumb couldn’t sleep that night, thinking about that man. Plumb says, “I kept wondering what he looked like in a Navy uniform: a white hat, a bib in the back, and bell-bottom trousers. I wonder how many times I might have seen him and not even said ‘Good morning. How are you?’ or anything because, you see, I was a fighter pilot and he was ‘just a sailor’”. Plumb thought of the many hours the sailor had spent at a long wooden table in the bowels of the ship, carefully weaving the shrouds(伞罩) and folding the silks of each chute, holding in his hands each time the fate of someone he didn’t know. Sometimes in the daily challenges that life gives us, we miss what is really important. We may fail to say hello, please, thank you, congratulate someone on something wonderful that has happened to them, give a compliment, or just do something nice for no reason. As you go through this week, this month, this year, recognize people who pack your parachutes. 小题1:Why didn’t Plumb say hello to the sailor each time he passed him on the Kitty Hawk? A.He thought the sailor was just an unimportant man. B.He didn’t like him at that time. C.He was very busy then. D.He didn’t know him well then. 小题2: What did the sailor do on the Kitty Hawk at the Viet Nam War? A.weaved clothes for the pilots. B.repaired the wooden table in the ship. C.helped the jets start. D.packed the parachutes for the fighter pilots. 小题3: What does the writer think we should do? A.We should help each other if they are in trouble. B.We shouldn’t look down upon the sailors. C.We should be thankful to others’ help. D.We should be honest to our friends. 小题4: Which is the best title for the passage? A.A story about a sailor. B.Who pack your parachutes? C.Don’t forget your past! D.Never forget your friends!
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【判断题】若集合 A 上的关系 R 是对称的,则R的逆关系 也是对称的。
A.
正确
B.
错误
【简答题】怎样划分晶族与晶系?下列对称型各属于何晶族与晶系? L 2 PC 3L 2 3PC L 4 4L 2 5 PC L 6 6L 2 7PC C 3L 4 4L 3 6L 2 9PC L 3 3L 2 L 3 3L 2 3PC 3L 2 4L 3 3PC
【简答题】A.hD+L/B B.S+hD+L/P C.S+hD+L/B D.S+L/B
【简答题】如图所示,A,B,C是直线L上三点,P为直线L外一点,已知PC⊥L,PA=4cm,PB=5cm,PC=3cm,则P到直线L的距离为_________.
【简答题】下列对称型属于何种晶族与晶系? (1)L2PC;(2)L44L25PC;(3)L66L27PC;(4)3L24L33PC;
【多选题】不安全接种可引起()
A.
传播血源性疾病
B.
化脓性或细菌性感染
C.
创伤性麻痹
D.
中毒
E.
过敏性休克
【简答题】失压(或零压)保护 是指电动机在正常运行时,由于外界某种原因引起突然断电时,能( )切断电动机电源,当重新供电时,保证电动机( )启动的一种保护。接触器自锁控制也可实现失压保护。因为接触器自锁触头和主触头在电源断电时已经断开,使控制电路和主电路都不能接通,所以在电源恢复供电时,电动机就不会自行启动运转,保证了人身和设备的安全。
【简答题】安全生产 无疑,法律是安全生产的有力保障,但现代的职业安全观念早已不仅仅局限于直接的政府法规调节。通过保险体系实施的经济调节也已成为一种重要的调节手段,贯穿于整个安全生产的过程中。 保险金是这一经济杠杆的支点。与普通的财产险不同,安全生产的保金与企业工作环境息息相关。保金的费率不是统一的,而是根据企业风险的大小灵活制定。因此建筑业的保金必然高于银行业的保金。即使在同一个行业,企业本身工作环境的不同...
【单选题】反安慰剂效应,性质与安慰剂效应完全相反,它并不是由所服用的药物引起的,而是由于接受药物的人士对药物的效力抱有负面的态度,不相信治疗有效.可能导致病情恶化的现象。 根据上述定义,下列不涉及反安慰剂效应的一项是:
A.
科学家进行1临床试验。让患者服下完全没有任何药效的胶囊.并告之该药有很严重的副作用,结果大约1/4的患者真的体验到了有害的副作用
B.
让一批志愿者吸入一种没有任何毒害作用的气体,并告之该气体含有可疑的环境毒害物,会导致头痛、恶心、皮肤发痒,结果吸入气体的人中有很多表现出这些症状
C.
几个城里人到野外郊游,休息时,其中一人接过同伴的水壶喝了一口水,感叹道:山里的水真甜,城里的水真是没法比。水壶的主人听罢笑道:壶里的水是出发前接的
D.
某人在检查身体时被确诊为肝癌晚期,只剩几个月的生命。后来,他果真在预计的时间死去。结果尸体解剖的时候才发现,他的医生搞错了,肿瘤很小,且没有扩散
【简答题】氰化钾是剧毒物质,一般为白色圆球形硬块,粒状或结晶性粉末。接触皮肤的伤口或吸入微量粉末即可中毒死亡,由于氰化钾的毒性,该品根据《危险化学品安全管理条例》受公安部门管制。氰化钾对人体危害非常大,如果不小心吸入、口服或经皮吸收均可引起急性中毒,而且口服50~100mg即可引起猝死的情况。近日,这样一条消息:国产食盐里有种可怕的添加剂—亚铁氰化钾。在烹饪时,亚铁氰化钾会分解成氰化钾这种剧毒物质。...
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