【单选题】What type of sentence is 'Three passions, simple but overwhelmingly strong, have governed my life.'?
B.
A coordinate sentence.
【单选题】设在直角坐标系{O;i,j,k}下,向量a=i+2j-3k,则向量a在向量i上的射影(投影)为( )。
【简答题】a student who is in his or her first year at a high school or college
【简答题】设 e 1 , e 2 为单位向量.且 e 1 、 e 2 的夹角为 π 3 ,若 a = e 1 +3 e 2 , b =2 e 1 ,则向量 a 在 b 方向上的射影为______.
【简答题】改错:Three passions have governed my lifeThree passions have governed my life: the longing for love, the search into knowledge, and the unbearable __1__pity for the suffering of mankind.I have sought of...
【单选题】A student buries his/her head reading in a library or doing researches in a laboratory all day long may turn out to be nobody but a book nerd. Likewise, a student only cares about wandering around the...
【单选题】在坐标平面上直线l的方向向量 e =(- 4 5 , 3 5 ) ,点O(0,0),A(1,-2)在l上的正射影分别为O 1 、A 1 ,设 O 1 A 1 =λ e ,则实数λ=( )