【单选题】--- ________ you ________ to live in Qiandao Lake? --- Yes , I did. But in 2005, I came to Hangzhou with my family.
【判断题】一般位置直线经过一次换面就能使其成为新投影面的平行线,从而可求直线的实长及与相应投影面倾角的实际大小。
【简答题】I came to live here where I am now between Wounded Knee Greek and Grass Greek。Others came too, and we made these little grey houses of logs that you see, and they are square. It is a bad way to live, ...
【单选题】设 A = { 1,2,3,4 } , A 上二元关系 R 定义为: R ={( 1,2) ,( 2,1) ,( 2,3) ,( 3,4) }. R 的传递闭包T(R)=R ∪B. B=
A.
{(1,1),(2,2),(3,3),(4,4)}
C.
{(1,1),(2,2),(3,3),(4,4),(3.2),(4,3)}
D.
{(1,1),(1,3),(1,4),(2,2),(2,4)}
【单选题】设A={1,2,3},A上二元关系R={〈1,2〉,〈2,1〉,〈2,3〉},则R具有的性质是
【单选题】Could I do some explanations? I ________ to call on you yesterday, but someone came to see me just when I was about to leave. [ ]
【单选题】设 A = { 1,2,3,4 } , A 上二元关系 R 定义为: R ={( 1,2) ,( 2,1) ,( 2,3) ,( 3,4) }. R 的对称闭包T(R)=R ∪B. B=
A.
{(1,1),(2,2),(3,3),(4,4)}
C.
{(1,1),(2,2),(3,3),(4,4),(3.2),(4,3)}
D.
{(1,1),(1,3),(1,4),(2,2),(2,4)}
【判断题】理答的主要作用是不断激发和提升学生的思考。
【单选题】— You look scared. What happened? — Well , I _______ along the street ________ the UFO landed.