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I had worried myself sick over Simon’s mother coming to see me. I was a new , and I gave an honest account of the students’ work. In Simon’s case, the grades were awfully low. He couldn’t read his own handwriting. he was a bright student. He discussed adult subjects with nearly adult comprehension. His work in no way reflected his . So when Simon’s mother entered the room, my palms(手掌心) were sweating. I was completely for her lisses on both my cheeks. “I came to thank you,” she said, surprising me beyond speech. me, Simon had become a different person. He talked of how he me, he had began to make friends, and for the first time in his twelve years, he had spent an afternoon at a friend’s house. She wanted to tell me how grateful she was for the I had nurtured(培养) in her son. She kissed me again and left. I sat, stunned (惊呆), for about half an hour, what had just happened. How did I make such a life-changing difference to that boy without knowing it? What I finally came to was one day, several months before, when some students were reports in the front of the class, Jeanne spoke , and to encourage her to raise her voice, L had sai, “Speak up. Simon’s the expert on this. He is the one you have to convince, and he can’t hear you in the of the room.” That was it. From that day on, Simon had sat up straighter, paid more attention, more, and became happy. And it was all because he to be the last kid in the last row. The boy who most needed was the one who took the last seat that day. It taught me the most lesson over the years of my teaching career, and I’m thankful that it came and positively. A small kindness can indeed make a difference. 小题1: A.cleaner B.reporter C.monitor D.teacher 小题2: A.Or B.And C.But D.So 小题3: A.courage B.abilities C.feelings D.dream 小题4: A.desperate B.responsible C.unprepared D.unsuitable 小题5: A.Because of B.In spite of C.Apart from D.As for 小题6: A.loved B.envied C.pleased D.criticized 小题7: A.gradually B.constantly C.recently D.obviously 小题8: A.self-respect B.self-doubt C.self-pity D.self-defence 小题9: A.imagining B.observing C.wondering D.regretting 小题10: A.also B.even C.always D.still 小题11: A.expect B.remember C.believe D.accept 小题12: A.writing B.reviewing C.editing D.giving 小题13: A.quietly B.repeatedly C.quickly D.firmly 小题14: A.lucky B.lonely C.only D.likely 小题15: A.entrance B.middle C.front D.back 小题16: A.slept B.smiled C.shouted D.quarreled 小题17: A.intended B.pretended C.refused D.happened 小题18: A.change B.praise C.thanks D.visits 小题19: A.difficult B.painful C.valuable D.enjoyable 小题20: A.early B.slowly C.frequently D.occasionally
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【多选题】如图所示的回路,已知活塞运动时的负载F=1.5kN,活塞面积为15×10 -4 m 2 ,溢流阀调整值为4.5MPa,两个减压阀的调整值分别为p J1 =3.5MPa和p J2 =2MPa,如油液流过减压阀及管路时的损失可忽略不计,简单计算并回答:
A.
A、B、C三点的压力为3.5、4.5、2MPa
B.
A、B、C三点的压力为1、1、1MPa
C.
油缸可以运动
D.
油缸运动到终点时,A、B、C三点的压力为3.5、4.5、2MPa
【多选题】学前儿童科学教育内容的特点是()
A.
在引导学前儿童了解周围环境的同时,了解人体自身
B.
让学前儿童感受技术、崇尚科学
C.
在认识周围环境的同时,进行环境保护教育
D.
把认识个别物体的属性和认识物体的多样性结合起来
【简答题】6-7在图6-9所示回路中,已知活塞运动时的负载F=1200N,活塞面积A=15×10 -4 m 2 ,溢流阀调整值为p Y =4.5MPa,两个减压阀的调整值分别为p J1 =3.5MPa和p J2 =2MPa,如油液流过减压阀及管路时的损失可略去不计,试确定活塞在运动时和停在终端位置处时,A、B、C三点压力值。
【单选题】如图所示回油节流调速回路,已知液压泵的的供油流量 q=25 L/min ,负载 F=40000N ,溢流阀调定压力 p Y =5.4MP ,液压缸无杆腔面积 A 1 =80cm 2 ,有杆腔面积 A 2 =40cm 2 ,液压缸工进速度υ =0.18m/min ,节流阀为薄壁孔, C q =0.62 。不考虑管路损失和液压缸的摩擦损失,试掌握计算步骤并计算后回答: 1 )液压缸工进时液压系统的效率...
A.
5.33%,10.8MPa,0.66m/min
B.
5.33%,5.4MPa,0.66m/min
C.
5.33%,2.7MPa,0.66m/min
D.
15.33%,5.4MPa,0.66m/min
【简答题】如图6-33b所示的回油节流调速回路,已知液压泵的供油量qp=25L/min,负载F=40000N,溢流阀调定压力Pp=5.4MPa,液压缸无杆腔面积A1=80×10-4m2,有杆腔面积A2=40×10-4m2,液压缸工进速度v=0.18m/min,不考虑管路损失和液压缸的摩擦损失,试计算: 1)液压缸工进时液压系统的效率。 2)当负载F=0时,活塞的运动速度和回油的压力。
【简答题】如图 所示液压回路,已知溢流阀的调定压力为P y =50×10 5 Pa,顺序阀的调定压力为P x =30×10 5 Pa,液压缸的有效面积A=50cm 2 ,负载 F=10000N。(1)试求活塞运动时和活塞运动到终端后,A、B两处的压力各为多少?(2)当负载F=20000N时,活塞运动时和活塞运动到终端后,A、B两处的压力各为多少?(管路压力损失不计)
【单选题】《第二性》的作者是谁?
A.
加缪
B.
萨特
C.
波伏娃
D.
阿伦特
【单选题】在题图所示回路中,已知活塞运动时的负载F=1.2KN,活塞面积 ,溢流阀调整值为p=4.5MPa,两个减压阀的调整值分别为PJ1=3.5MPa和PJ2=2MPa,如油液流过减压阀及管路时的损失可略去不计,试确定活塞在运动时和停在终端位置处时,A、B、C三点的压力值。
A.
运动时,PA=PB=PC=0.8MPa。终端处,PA=4.5MPa,PB=3.5MPa,PC=2MPa
B.
运动时,PA=PB=PC=0.8MPa。终端处,PA=3.5MPa,PB=3.5MPa,PC=2MPa
C.
运动时,PA=PB=PC=0.8MPa。终端处,PA=4.5MPa,PB=2MPa,PC=2MPa
D.
运动时,PA=4.5MPa,PB=3.5MPa,PC=0.8MPa。终端处,PA=4.5MPa,PB=3.5MPa,PC=2MPa
【简答题】在图6-9所示回路中,已知活塞运动时的负载F=1200N,活塞面积A=15×10 -4 m 2 ,溢流阀调整值为p Y =4.5MPa,两个减压阀的调整值分别为p J1 =3.5MPa和p J2 =2MPa,如油液流过减压阀及管路时的损失可略去不计,试确定活塞在运动时和停在终端位置处时,A、B、C三点压力值。
【单选题】《第二性》的作者是( )
A.
苏珊·桑塔格
B.
波伏娃
C.
汉娜·阿伦特
D.
萨特
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