【简答题】记[x]为不超过实数x的最大整数,例如,[2]=2,[1.5]=1,[-0.3]=-1。设a为,数列{x n }满足x 1 =a, ,现有下列命题: ①当a=5时,数列{x n }的前3项依次为5,3,2; ②对数列{x n }都存在k,当n≥k时总有x n =x k ; ③当n≥1时, ; ④对某个k,若x k+1 ≥x k ,则 。 其中的真命题有( )(写出所有真命题...
【简答题】听较长对话,回答问题 1.What does Tom play? A. The piano. B. The drums. C. The guitar. 2.Where does Tom play? A. At school. B. In a club. C. In his be droom. 3.When does Tom have breakfast? A. At five o’clock. B...
【单选题】Tom _____ the piano in the room now.
【单选题】改变通入三相异步电动机电源的相序就可以使电动机( )
【简答题】设a,b为正实数.现有下列命题: ①若a 2 -b 2 =1,则a-b<1; ②若 -=1,则a-b<1; ③若| - |=1,则|a-b|<1;④若|a 3 -b 3 |=1,则|a-b|<1. 其中真命题有____.(写出所有真命题的编号)
【单选题】I’ve just seen no more than one copy of “The Piano Teacher” in the bookshop opposite. Tom, go and buy _____ back.
【简答题】设a,b为正实数,现有下列命题:①若a 2 -b 2 =1,则a-b<1;②若 ,则a-b<1;③若 ,则|a-b|<1;④若|a 3 -b 3 |=1,则|a-b|<1。其中的真命题有( )。(写出所有真命题的编号)
【单选题】改变通入三相异步电动机电源的相序就可以使电动机
【单选题】Tom is better () playing the piano than computer games.
【多选题】关于防盗报警,下列哪些说法是正确的
A.
防盗报警触发后,如果不打开点火开关,警报会一直响
B.
车内监控关闭后,下次使用车辆,必须重新按压车内监控按钮以开启其功能
D.
C7车辆上,防盗报警和防拖车监控集成在一个按钮上