皮皮学，免费搜题
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【单选题】
牌号为J422的焊条对应的焊条型号为（）A.
E4303
B.
E4301
C.
E4313
D.
E4312
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皮皮学刷刷变学霸
举一反三
【简答题】He bought an antique vase from the flee market.
【简答题】They talked to him for hours, (try)______to persuade him to change his mind.
【单选题】An artist who was recently travelling on a ferry to the southern island discovered _________ a long lost antique Greek vase.
A.
at random
B.
by chance
C.
in turn
D.
on occasion
【简答题】如果我们能有竞争力地——也就是以低廉的价格——把海水净化成淡水,这将有利于人类的长期利益,这一成就将使其他所有科学成就都显得渺小。
【简答题】例题 1 有一个额定值为 “ 1 kW , 220 V ” 的电暖器,正常工作时的工作电流是多大?如果由于供电紧张,电压下降到 160 V ,它的实际功率将是多少?
【简答题】可吃的,可食用的
【单选题】The antique vase grandpa bought at the flea market yesterday was a forgery.
A.
man-made
B.
natural
C.
crude
D.
real
【简答题】A few days ago, my sister Liz and I talked about Dad, and we decided to get him a little something for Father's Day. We talked about the times when we were up and how Mom and Dad used to play the ‘goo...
【简答题】某万用表的直流电压档有三个,即 10V , 100V 和 250V ,如下图所示,试计算分压电阻 R2 、 R3 、 R4 。(其中 Ic=0.6mA,Rc=280 Ω)
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