【判断题】活塞在上止点时,活塞顶上面的空间叫作发动机工作容积。
【简答题】设矩阵 (其中a>0,b>0), (Ⅰ)若a=2,b=3,求矩阵M的逆矩阵M -1 ; (Ⅱ)若曲线C:x 2 +y 2 =1在矩阵M所对应的线性变换作用下得到曲线C′: ,求a,b的值.
【判断题】发动机活塞在上止点时,第一道活塞环所对应的缸壁位置磨损量最大。( )
【单选题】She was very happy. She ran of all the runners.
【单选题】________ she ran to the classroom, the teacher had begun the class.
【单选题】发动机的活塞在上止点时,活塞顶上面整个空间的容积称( )。
【判断题】活塞在上止点时,活塞顶上面的空间称为发动机工作容积。
【判断题】张生所处的时代盛行一种“一婚二宦”的现象。()
【单选题】She ran across the street because she ______ her brother on the other side.