钢芯铝绞线在同一处损伤,导线强度损失不超过总拉断力的5%,且截面积损伤不超过总到点部分截面积的7%,应采用()
A、砂纸磨光
B、缠绕补修
C、补修管补修
D、切断重接
参考答案:B
.I got caught in the rain and was wet all over. _____I had followed my mother’s advice and take an umbrella with me!
A.As if
B.Even if
C.If only
D.Only if
人体能对抗再感染的主要原因是()
A.非特异性免疫功能
B.特异性免疫功能
C.预防用药
D.注射疫苗