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【简答题】
Combine two short sentencesinto a long one after the model. Model: You have finished your formal education. You search for jobs that willallow you to further expand your transferable knowledge. → Once you have finished your formaleducation, search for jobs that will allow you to further expand yourtransferable knowledge. 1 You start a task. You must bear itthrough. _______________________________________ 2 She gets to know everyone else. I am sureshe will be happy here. _____________________________________________________________ 3 The project is completed. Opening hoursof this theatre will be extended. _____________________________________________________________
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举一反三
【单选题】（理）若随机变量的分布列如下表，则Eξ的值为（ ） ξ? 0 1 2 3 4 5 P 2x 3x 7x 2x 3x x
A.
1 18
B.
1 9
C.
20 9
D.
9 20
【单选题】Why does the woman's initial excitement turn to disappointment?
A.
She is told that all swimming classes are full.
B.
She learns that she will have to pay extra for classes.
C.
She finds out that there are no swimming classes at her level.
D.
She thought all sports activities were supervised by coaches.
【判断题】三相半波可控整流电路,不需要用大于60o小于120o的宽脉冲触发,也不需要相隔60o的双脉冲触发,只用符合要求的相隔120o的三组脉冲触发就能正常。
A.
正确
B.
错误
【判断题】要使三相全控桥式整流电路正常工作,对晶闸管触发方法有两种,一是用大于 60 o小于 120 o的宽脉冲触发;二是用脉冲前沿相差 60 o的双窄脉冲触发。
A.
正确
B.
错误
【单选题】静脉注射硫喷妥钠作用维持时间短暂的主要原因是( )
A.
迅速从肾排出
B.
迅速在肝破坏
C.
难穿透血脑屏障
D.
从脑组织再分布到脂肪等组织中
E.
迅速与血浆蛋白结合
【单选题】船长下达弃船的命令后______应按______完成各自的弃船准备工作
A.
轮机长/船长指令
B.
轮机长/船长指令
C.
全体船员/船长指令
D.
全体船员/应急部署
【单选题】若随机变量X的分布列如下表，则E（X）=（ ） X 0 1 2 3 4 5 P 2x 3x 7x 2x 3x x
A.
1 18
B.
1 9
C.
9 20
D.
20 9
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