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【简答题】
设α1=(2，-1，3，0)，α2=(1，2，0，-2)，α3=(0，-5，3，4)，α4=(-1，3，t，0)，则________时，α1，α2，α3，α4线性相关．
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举一反三
【单选题】Roller coasters seem an inappropriate metaphor for theme parks in that
A.
coasters are no long the best thrilling hallmarks of a park visit.
B.
coasters avail nothing for raising the turnover of theme parks.
C.
earning profit from theme parks is anything but a thrilling rush.
D.
making-money from theme parks is hardly tougher than rolling coasters.
【单选题】I can't wait to enjoy all the shows and ride the Roller Coasters. 句中划线单词的正确意思是_____。
A.
演出和赛车
B.
演出和旋转木马
C.
演出和高速滑道
D.
演出和过山车
【单选题】The shrill and excitement brought about by riding roller coasters were ______ imagination. [ ]
A.
above
B.
over
C.
beyond
D.
across
【简答题】Are you looking for a different kind of camp for the summer of 2011? If you like to visit America’s most interesting roller coasters( 过山车 ), maybe Thrill Coaster Tours is the perfect choice for you. T...
【简答题】Chimelong Paradise, opened in 2006, is one of China’ s largest (1) ___________. This is a collection of the most thrilling roller coasters in the world. You will (2) _______ as loudly as you can! The ...
【简答题】The History of the Roller Coaster The first roller coasters were created in Russia in the 17th century. However, they were not like modern ones. They were more like big sleds. People rode down steep i...
【单选题】The coasters ________.
A.
always sail across the high seas
B.
commonly carry oil cargo
C.
are mainly tankers
D.
sail on coastal routes and up rivers to inland ports
【单选题】I can't wait to enjoy all the shows and ride the Roller Coasters . 句中划线短语的意思是( )
A.
碰碰车
B.
橡皮艇
C.
过山车
D.
冲浪板
【单选题】商业物流是指商品被生产出来以后,通过销售进入最终消费的物流活动,它的顺序是?
A.
商贸企业销售→生产企业发货→最终消费的物流活动
B.
最终消费的物流活动→商贸企业销售→生产企业发货
C.
生产企业发货→商贸企业销售→最终消费的物流活动
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