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【判断题】
保安电源的作用是当 00V 厂用电源全部失去后,保障机组安全停运。()A.
正确
B.
错误
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【简答题】Fill in the gaps with words or phrases given in the box. Change the form where necessary. t hrust overseas fertile split k een sustain grip reflect i dentify margin previous hesitate b ud whichever sl...
【单选题】Success belongs to those who work hard. I firmly believe that, _____my own efforts, I can make it.
A.
showing off
B.
leaving out
C.
relying on
D.
up
【简答题】The former lake bed is now a _____________ plain producing good crops of wheat. thrust overseas fertile split keen sustain grip reflect identify margin previous hesitate bud whichever slim glow
【单选题】We were swimming in the lakesuddenly the storm started．
A.
when
B.
while
C.
until
D.
before
【多选题】下面哪些句子用 sway 不恰当?
A.
We also wondered if a different context would sway students' opinions and focus as Twitter users within a higher education classroom.
B.
A faint, sharp wind made the branches of the tree around the lake sway slightly, like enraptured concertgoers. Ramon and the rest of the family had retreated
C.
How would I describe former President Bill Clinton's golf sway ? Entertaining and erous. Let's start with the good stuff.
D.
…my knees and shuffle forward, but Sean sleeps on a water bed so I sway back and forth, then kind of topple into him. He looks down on…
E.
He also said that the boss' mood can sway wildly from day to day’? depending upon the success of SpaceX and his car company…
【单选题】已知集合A={x|x 2 -5x+6≤0}，B={x||2x-1|＞3}，则集合A∩B=（ ）
A.
{x|2≤x≤3}
B.
{x|2≤x＜3}
C.
{x|2＜x≤3}
D.
{x|-1＜x＜3}
【简答题】如图所示,已知电源电动势E 1 =18V,E 3 =5V,内阻r 1 =1Ω, r 2 =1Ω,外电阻R 1 =4Ω, R 2 =2Ω, R 3 =6Ω, R 4 =10Ω,电压表的读数是28V,求电源电动势E 2 和A、B、C、D各点的电位。
【简答题】The former lake bed is now a __________ plain producing good crops of wheat.
【简答题】计算题：如图所示，已知电源电动势E 1 ＝6V，E 2 ＝1V，电源内阻不计，电阻R 1 ＝1Ω，R 2 ＝2Ω，R 3 ＝3Ω，试用支路电流法求各支路的电流。
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