( )利用行业历年销售额与国民生产总值、国内生产总值的周期资料进行对比，并将其在坐

螺栓连接中，属于摩擦防松的方法为( )。

A．止动垫圈防松

B．粘合剂防松

C．对顶螺母防松

D．开口销防松

传染病能够在人群中流行，下列疾病中属于传染病的是 [ ]

A．艾滋病      

B．糖尿病        

C．近视眼       

D．地方性甲状腺肿

完成句子。

1. You ______ (本没必要告诉) her the news, for I had told her about it earlier.

2. The ground is quite wet. It ______ (一定下雨了) last night.

3. We ______ (本该买) a new lock for the front door.

4. You ______ (不可能看见) Bob at the meeting yesterday; he has been on holiday in Paris for a week.

5. — He stayed at a hotel while in New York.

    — Oh, did he? He ______ with Barbara. (也许和Barbara待在一起)

神经失用称为()
轴索离断是指()
神经离断是指()

A．传导阻滞(神经阻滞) 

B．髓鞘完整，但轴索变性 

C．轴索离断 

D．髓鞘离断 

E．轴索与髓鞘同时离断