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听力原文: There was once a man who spent all his time in his glasshouse. Flowers was his name, and flowers were his main joy in life. He grew flowers of every color under the sun. He grew these flowers in order to enter them for competition. His greatest hope in life was to grow a rose of an entirely new color that would win him the silver cup for the Rose of the Year. Mr. Flowers' glasshouse was close to a public path, which was always used by children walking to and from school. Boys were often attracted to throw a stone or two at his glasshouse. So Mr. Flowers did his best to be in or close by his glasshouse at the beginning and end of the school day. However, it was not convenient or possible to be on guard all the time. Mr. Flowers had tried in many ways to prevent harm to his glasshouse, but nothing that he had done had been successful. Then, just as he was giving up hope of ever winning the battle, and of growing the Rose of the Year, he had a truly wonderful idea. He put up a large notice made of good, strong wood, some meters away from the glasshouse, where it could be clearly seen from the path. He had painted on the board the words: DO NOT THROW STONES AT THIS NOTICE. After this, Mr. Flowers had no further trouble. The boys were much more attracted to throw stones at the notice than at the glasshouse. (33)
A.
To grow beautiful flowers.
B.
To grow a rose of new color and win a prize.
C.
To grow all kinds of flowers in the world.
D.
To take part in the competition.
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举一反三
【单选题】15K 标准状态下,反应 [Cu(CN) 4 ] 2- +4H + = 4HCN+Cu 2+ 自发进行的方向应为 ( ) 。 ( 已知 298.15K 时, {[Cu(CN) 4 ] 2- }=2.0×10 9 , (HCN)=6.17×10 -10 )
A.
正向
B.
逆向
C.
平衡
D.
三种情况都有可能
【多选题】在奥氏体等温形成过程中,以下说法中正确的是
A.
随相变温度升高,碳在奥氏体中的扩散系数增大
B.
随着相变温度升高,碳在奥氏体中的浓度梯度增大
C.
由于奥氏体与铁素体之间的浓度差小于奥氏体与渗碳体之间的浓度差,因此奥氏体在铁素体中的长大速度大
D.
奥氏体在铁素体中长大速度远大于向渗碳体中长大速度,因此,即使铁素体体积含量更高,往往也会有渗碳体剩余
【判断题】材料的化学成分对脆性转变温度没有什么影响。
A.
正确
B.
错误
【判断题】298K时,石墨的标准摩尔生成焓等于零。
A.
正确
B.
错误
【单选题】转杯纺纱无论是自排风式还是抽气式,其纺纱原理均为利用离心力的作用。即纺纱杯高速回转,纺杯内( ),离心力可使从分梳腔转移到纺纱杯内的棉纤维产生凝聚而成为纤维环(须条),须条被加捻以后便成为纱条。
A.
须条断裂
B.
产生气流回转
C.
产生离心力
D.
阻捻盘高速回转
【单选题】转杯纺纱无论是自排风式还是抽气式,其纺纱原理均为利用离心力的作用。即纺纱杯高速回转,纺杯内产生离心力, 可使从分梳腔转移到纺纱杯内的棉纤维产生凝聚而成为纤维环(须条),须条被加捻以后便成为纱条。 A B C D
A.
离心力
B.
纱线张力
C.
聚合力
D.
阻捻盘阻力
【多选题】2018N151X 下列疾病中,属于假膜性炎的是
A.
大叶性肺炎
B.
白喉
C.
细菌性痢疾
D.
风湿性心包炎
【简答题】《中国标准文献分类法》将我国标准分为( )个大类。
【单选题】企业在购、产、销的整个经营过程中,必须保持购买范围极为广泛的各种类别的货物和劳务的不变能力是( )
A.
财务资本保全
B.
实物资本保全
C.
财务与实物资本保全
D.
利润保全
【多选题】停工损失包括( )
A.
停工期间耗用的材料和动力费
B.
停工期间应支付的生产工人薪酬
C.
停工期间应负担的制造费用
D.
季节性生产企业停工期间的费用
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