货叉的垂直段用以和()相连接。
参考答案:叉架
已知⊙A与⊙B相切,两圆的圆心距为5,⊙A的半径为2,则⊙B的半径为______.
Can you tell me your _____ of success?
There is no easy way to learn English well. Just work hard.[ ]
A. duty
B. trouble
C. secret
D. rule