当梯形螺纹丝杆的磨损不超过齿厚的（）时，通常用车深螺纹的方法来消除。
A、5%
B、8%
C、10%
D、15%
参考答案：C
His host family was very nice. They___________ make him feel at home.
a. got in the way of b. went out of their way to c. was in a way to d. by the way of
下列哪项不符合风湿热性关节炎的特点：()
A．常侵犯大关节，呈游走性、对称性
B．炎症消退后功能完全恢复
C．X线检查可有关节面破坏，关节间隙变窄
D．急性期可有肿、热、痛
E．抗“O”增高
