两圆的半径分别为3和5，若两圆的圆心距等于2，则这两圆的位置关系是 ▲ ．
两圆内切
∵两圆半径分别为3和5，圆心距为2，则5-3=2，∴两圆内切．
Tom feared to go home after his failure in the exam because the ____ stream of discontent from his
parents would drive him crazy. [ ]
A. actual
B. gradual
C. efficient
D. constant
肌电图检查能作为临床康复评定的指标是（）
A.插入电位延长
B.正相电位
C.纤颤电位
D.低压电位
E.群放电位
