Several students of our school won a(n) ________ victory in the English Drama Contest with

their excellent performing talents. 　　[ ]

A. inescapable 　　　　　

B. dispensable

C. unalterable 　　　　　

D. indisputable

下列因素不会使点焊机影响焊接质量的有（）

A、加工数量

B、电极压力

C、焊接电流

D、上、下电极光洁度