平衡是指物体相对于地面保持(),或匀速()运动的状态。
查看答案
While mother _______ some washing, I _____ a kite for Kate.
A. did, made
B. was doing, made
C. was doing, was making
D. did, was making
自我认同感包括时间上的连续性和空间上的一致性。()
A. 对
B. 错
“_______ you angry then?” “they ______ too much noise.”
A. are, were making
B. were, were making
C. are, made
D. were, made
画单个构件受力图时,应先取出构件作为。
A. 分离体
B. 总体