题目内容
设A是5阶矩阵，且R(A)=3, 则A的伴随矩阵是零阵。
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方阵A经过初等变换前后的行列式值不一定相等。
A plane disaster Sunday has increased fears among already worried travelers, especially those in Southeast Asia.AirAsia flight QZ8501 __1_________ from radar Sunday while flying from Surabaya, Indonesia to Singapore. The plane was carrying 155 passengers and seven __2___________. All but seven were Indonesian. Three South Koreans were also on the plane along with a passenger each from Britain, France, Malaysia and Singapore. AirAsia is a ___3________ airline with links to AirAsia Malaysia. Malaysian __4______________has had a difficult 2014.In March, the national _5_______, Malaysia Airlines, had a plane disappear over the Indian Ocean. That plane was carrying 239 passengers and crew from Kuala Lumpur to Beijing, China. ___6__________ have found no sign of the plane or the people it carried. The plane's disappearance __7_______ the world.Several months later, Malaysia Airlines ___8______ another disaster. Flight 17 went down in Ukraine on July 17 after an apparent ___9______ strike. It was traveling from Amsterdam, Holland to Kuala Lumpur, Malaysia at the time. All 298 people on the plane were killed in the __10_____. Many travelers feared flying Malaysian airlines after flights 370 and 17. Now, many travelers are concerned about Air Asia.
They ————————（didn't see, haven't seen) each other since September.
Ginain_____________ at college for one year.
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