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根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两多余选项。 Test-taking tips Do you sweat, check your pencil, and feel butterflies in your stomach as your teacher hands out the test paper? A lot of people feel anxious when it is time to take a test. Here are some tips for taking tests: 1 . Your memory recall will be much better if you have had enough rest. In a scientific study, people who got enough sleep before taking a math test did better than those who stayed up all night studying. Read the test through first. Once you have the test paper in front of you, read over the entire test, checking out how long it is and all the parts that you are expected to complete. 2 . If something seems unclear before you start, do not panic: ask the teacher. Focus on addressing each question individually. 3 . Instead, answer the best way you can or skip over the question and come back to it after you have answered other questions. Relax. 4 . Of course you can not get up and move around in the middle of a test, but you can wiggle (扭动) your fingers and toes, take four or five deep breaths. As we all know, It can be easy to forget things we know well. During a test, if you forget something and start to get tense, it suddenly becomes much more difficult to remember. Finished already? Although most teachers will let you hand your test paper in early, it is usually a good idea to spend any extra time checking over your work. 5 . On the other hand, if you have 5 minutes until the bell rings and you are still writing, wind up whatever you are working on without panic. A.  Be sure you have studied properly. B.  Get enough sleep the night before the test. C.  This will allow you to decide how much time you have for each section. D.  As you take the test, if you do not know an answer, do not worry about it. E.  As the teacher hands out the test paper, be sure you know what is expected of you. F.  You can also add details that you may not have thought you’d have time for. G.  If you are so nervous that you blank out, you might need a mini-break.
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【多选题】运输卖方市场的基本特征有()。
A.
运输供给大于运输需求
B.
运输需求大于运输供给
C.
运输供给方竞争激烈
D.
运输需求方得益
E.
运输供给方得益
【多选题】航空运输市场供给的特点主要有( )
A.
运输供给的整体不可分性B运输供求的平衡难以控制
B.
运输供给的部分可替代性
C.
运输供给的外部性
D.
运输供给总是与需求处于均衡状态
【单选题】对于如图所示的分支管路,当A阀开大时,B路的机械能损失:
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/194f19a5edb762ae0e4df9d918e7e811.png">
B.
增大
C.
减小
D.
不变
E.
无法确定
【单选题】利用卡诺图化简逻辑函数时,8个相邻的构成矩形框的最小项可合并为1项,并消去( )个变量,。
A.
1
B.
2
C.
3
D.
4
【多选题】航空运输市场供给的特点主要是( )。
A.
运输供给的整体不可分
B.
运输供求的平衡难以控制
C.
运输供给的部分可替代性
D.
运输供给的外部性
【多选题】某化学反应器工艺规定操作温度为 (900 ± 10) °C 。考虑安全因素,控制过程中温度偏离给定值最大不得超过 80 °C 。现设计的温度定值控制系统,在最大阶跃干扰作用下的过渡过程曲线如题 图所示。试求该系统的过渡过程品质指标:最大偏差、超调量、衰减比、余差、振荡周期和过渡时间(被控温度进入新稳态值的 ± 1% (即 900 ́ ( ± 1% ) = ± 9 °C )的时间),并回答该控制系...
A.
最大偏差 A=950 - 900=50 ( ℃) ; 超调量 B=950 - 908=42 ( ℃) ; 由于 B ¢ =918 - 908=10 (℃),所以,衰减比 n=B : B ¢ =42 : 10=4.2 ;
B.
最大偏差 A=950 - 908=42 ( ℃) ; 余差 C=908 - 900=8 ℃ ; 振荡周期 T=45 - 9=36(min) ;
C.
过渡时间 t s =45min
D.
余差 C=908 - 900=8 ℃ ; 振荡周期 T=45 - 9=36(min) ; 过渡时间 t s =47min 。 因为 A=50 ℃ <80 ℃ , C=8 ℃ <10 ℃ ,所以,该控制系统能满足题中所给的工艺要求。
【简答题】输出重定向>和>>的区别是什么?
【简答题】运输市场供给的特点有__、__、__、__、__、__、
【多选题】运输买方市场的基本特征有()。
A.
运输供给大于运输需求
B.
运输需求大于运输供给
C.
运输供给方竞争激烈
D.
运输需求方得益
E.
运输供给方得益
【多选题】物流运输市场供给的特点有( )。
A.
不可储存性
B.
不平衡性
C.
成本转移性
D.
可替代性与不可替代性
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