绳索两端可靠固定，并收紧，绳索与（）接触处加衬垫
参考答案：棱角
白炽电灯上标有“220V 110W”字样，表明该灯正常发光时该灯两端的电压是______V，通过灯丝的电流是______A．
John regretted（）ashore yesterday.
A.not going
B.not having been going
C.not to go
D.not to be going
