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【简答题】
As Prime Minister Johnson faces the Brexit the championed Boris Johnson, Britain’s brash former foreign secretary and standard-bearer for leaving the European Union, on Tuesday won the contest to succeed Prime Minister Theresa May, with his party handing the job of resolving the country’s three-year Brexit nightmare to one of its most polarizing politicians. He would take office at one of the most critical moments in Britain’s recent history, immediately facing the toughest challenge of his career, to manage his nation’s exit from the European Union in little more than three months. But his policy swerves , lack of attention to detail and contradictory statements leave the country guessing how things will unfold . Johnson has doubled down lately on Brexit, promising to take Britain out of the European Union by the Oct. 31 deadline “ do or die ,” if necessary risking the economic dislocation of leaving without any agreement, rather than seek an extension. Johnson’s rare mix of charismatic bluster and absent-minded air – either charming or maddening , depending on the listener and the moment – and his unusual gift for communicating with voters have made him one of the country’s best-known politicians, and carried him to two terms as London mayor. But his support for Brexit, along with his penchant for pronouncements that do not always hold up under scrutiny , has also made him a highly divisive figure. The focus will soon shift to what clues that provides for whether he will pursue his hard line on Brexit or dial down the rhetoric and try to seek a deal with the European Union.
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【判断题】朱哲琴的《阿姐鼓》反映了中国90年代的文化现象。()
A.
正确
B.
错误
【简答题】常用于抢救心脏骤停的药物有 、 。
【判断题】企业本期发生的生产费用全部计入本期产品成本.
A.
正确
B.
错误
【单选题】下列过程可以视为可逆过程的是()
A.
非自发过程
B.
绝热节流过程
C.
无耗散的准静态过程
D.
自由膨胀过程
【简答题】钢铁的生产和使用是人类文明和社会进步的一个重要标志,但钢铁的锈蚀也给人类带来了巨大的损失. (1)某学生想探究铁生锈的条件,他将干燥、无锈的铁钉分别同时放入A、B、C三支试管中进行研究.请你帮助该学生完成下列实验设计的内容: 编号 操作方法 实验目的 A 探究铁在干燥空气中的生锈情况 B 放入铁钉,注入蒸馏水浸没铁钉,并用植物油液封 C 探究铁在有空气和水时的生锈情况 (2)自行车的主要材料钢铁易...
【单选题】在 LaTeX 源文件中输命令用的起始符号是:
A.
$
B.
&
C.
\
D.
%
【判断题】含有一个内部类编译后生成的类文件有2个
A.
正确
B.
错误
【单选题】为建立这些内燃机的理论循环,必须对一系列不可逆损失作必要的简化和假设,下列说法错误的是()。
A.
忽略发动机进排气过程,将实际的开口循环简化为闭口循环
B.
将燃烧过程简化为等容、等压或混合加热过程,将排气过程简化为等容放热过程
C.
把压缩和膨胀过程简化成理想的绝热等熵不可逆过程,忽略工质与外界的热量交换及其泄漏等的影响
D.
以空气为工质,并视为理想气体,在整个循环中工质物理及化学性质保持不变,比热容为常数
【多选题】设有 1mol 的过冷水蒸汽,其温度和压强分别是 24 °C 和 1 × 10 5 Pa 。当它转化为 24°C 下的饱和水 ( 即水与饱和水蒸汽达成平衡 ) 时, 下列说法中正确的 是 。 水蒸汽可视为理想气体 , 24°C 下 水 的 平衡蒸气压为 0.0298 × 10 5 Pa 。
A.
题中过程是否是可逆过程无法判断
B.
过程前后水蒸气-水系统熵变的大小确定,外界熵变也确定
C.
过程前后水蒸气-水系统熵变的大小确定,外界熵变不确定
D.
要使用熵变定义来计算过程熵变,可以假定 过冷水蒸汽 先发生可逆等温膨胀过程,使压强变为 0.0298 × 10 5 Pa,再发生等温等压的可逆过程变为水。
E.
水蒸气-水系统的熵变大约是 -120 J K -1
【单选题】禽流感病毒能感染多种家禽和野禽,在家禽中以( )的易感性为最高。
A.
鸡和鸭
B.
鸡和火鸡
C.
飞鸟和鸭
D.
火鸡和樱桃谷肉鸭
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