A:(﹣3,4,﹣10)
B:(﹣3,2,﹣4)
C:( 23 ,﹣ 12 , 12 )
D:(6,﹣5,11)
2017年4月27日,我国首艘货运飞船天舟一号与天宫二号成功完全首次“太空加油”,中国航天稳步进入空间站时代。这则好消息表明( )
请根据要求改写下列句子,每空一词。____ Susan has a good time on her birthday every year. (改为否定句)Susan ▲ ▲ a good time on her birthday every year.____ Xiao Li paid more than 4,000 yuan for his new iPhone 4? (对划线部分提问) ▲ ▲ did Xiao Li pay for his new iPhone4?____ The manager told them to be more creative in their work. (改为被动语态)They ▲ ▲ to be more creative in their work.____ Some children are so young that they can’t tell the bad from the good. (保持句意基本不变)Some children aren’t ▲ ▲ to tell the bad from the good.____ Rose went to the car exhibition yesterday. Danny went there, too. (保持句意基本不变) ▲ Rose ▲ Danny went to the car exhibition yesterday.
材料一:皮日休说:“尽道隋亡为此河,至今千里赖通波;若无水殿龙舟事,共禹论功不较多。”
材料二:“忆昔开元全盛日,小邑犹藏万家室。稻米流脂粟米白,公私仓廪俱丰实……男耕女织不相失。”
①若 a→ =2 b→ ,则 a→ 、 b→ 线性相关;
②若 a→ 、 b→ 为非零向量,且 a→ ⊥ b→ ,则 a→ 、 b→ 线性相关;
③若 a→ 、 b→ 线性相关, b→ 、 c→ 线性相关,则 a→ 、 c→ 线性相关;
④向量 a→ 、 b→ 线性相关的充要条件是 a→ 、 b→ 共线.
上述命题中正确的是____(写出所有正确命题的编号)