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【单选题】
How could astronauts survive a journey that covers hundreds of light years? ______.A.
By travelling at the speed close to 300,000 kilometres per second.
B.
By going into a sound sleep on the spaceship.
C.
By bringing their families together with them.
D.
By breaking Albert Einstein's theory of relativity.
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【单选题】某公司预计2019年第三、四季度销售甲产品分别为220件、350件,单价分别为2元、2.5元,各季度销售收现率为60%,其余部分下一季度收回,则该公司第四季度现金收入为( ) 元。
A.
440
B.
875
C.
701
D.
437.5
【简答题】企业若要获得一定的利润,则商品单价必须高于
【单选题】对称三相负载星形接于三相电源上, 正确的说法是
A.
一定要有中线
B.
线电压是相电压的1.732倍，线电压超前相电压30°
C.
相电压是线电压的1.732倍，相电压超前线电压30°
D.
线电流是相电流的1.732倍，线电流超前相电流30°
【单选题】Why does the common man in England seem to be as accurate - or as inaccurate - as the weatherman in his prediction ?
A.
Because the weather in England is so variable.
B.
Because the common man in England has as much knowledge about weather as the weathermen.
C.
Because by lunchtime there could be thunder and lightening in England.
D.
Because English weather always defies forecast.
【单选题】This passage is devoted to introduction to ______.
A.
the causes and effects of El Nino weather phenomena
B.
the worldwide monitoring network set up to predict El Nino
C.
the relationship between the ocean temperatures and climate patterns
D.
El Nino phenomena and destructive effects of one El Nino event on Ica
【单选题】（）气质类型的人感受性低，耐受性较高；不随意的反应强；具有可塑性和外倾性； 情绪兴奋性高，外部表情明显，反应快且灵活。
A.
粘液质
B.
多血质
C.
胆汁质
D.
抑郁质
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