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【简答题】
某种飞机在机场降落时，为了减小滑行距离，在触地的瞬间，飞机尾部张开减速伞，以增大阻力，使飞机迅速减速并停下来．现有一质量为9000kg的飞机，着陆时的水平速度为700km/h．经测试，减速伞打开后，飞机所受的总阻力与飞机的速度成正比(比例系数为k=6.0×106)．问从着陆点算起，飞机滑行的最长距离是多少?注kg表示千克，km/h表示千米/小时．
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举一反三
【单选题】The shortage of water became more ______ this summer with the highest temperatures in 40 years.
A.
needy
B.
latent
C.
uneasy
D.
acute
【单选题】The cold temperatures in this range can ____ most of the bacteria.
A.
cure
B.
gill
C.
kill
D.
skill
【单选题】The temperatures are somewhat lower than the average temperature in May this year.
A.
rather
B.
very
C.
a little
D.
less
【单选题】现有一批货物毛重280千克,1.2立方米从我国北京空运至英国伦敦。根据《航空货物公布直达运价》可知45千克以上300千克以下的运价为40元/千克,300千克以上500千克以下的运价为35元/千克。应收运费__________。
A.
11200
B.
10500
C.
9800
D.
8000
【简答题】[航空运费计算] 现有一批货物毛重280千克,从我国北京空运至英国伦敦。根据《航空货物公布直达运价》可知45千克以上300千克以下的运价为40元/千克,300千克以上500千克以下的运价为35元/千克。请计算应收运费。
【单选题】In the past 40 years, the average temperatures in the Arctic ______.
A.
have been rising as quickly as the global temperatures' rising'
B.
have been rising more slowly than the global temperatures' rising
C.
have been rising more quickly than the global average temperatures' rising
【单选题】The shortage of water became more ______ this summer with the highest temperatures in 40 years.
A.
needy
B.
latent
C.
severe
D.
dredge
【单选题】In the past 40 years, the average temperatures in the Arctic___
A.
have been rising as quickly as the global average temperatures' rising
B.
have been rising more slowly than the global average temperatures' rising
C.
have been rising more quickly than the global average temperatures' rising
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