【单选题】Our plane ______at six and landed in Beijing
A.
takes off, within four hours
B.
took off, four hours later
C.
rose up, after four hours
D.
raised up, in four hours
【判断题】位置更新是由移动台发起的。A. √ B. ×
【简答题】神经元根据突起的数目分为( )级、( )级、( )级神经元。
【单选题】5双大小不同的鞋子中任取4只,至少有一双配对的概率为()
【单选题】图示刚架,各杆的长度都等于 l ,若 A 支座下沉 1mm ,则 B 截面的竖向位移等于:( )
【单选题】当鼠标移到自动填充柄上,鼠标指针变为( )。