工厂生产一批零件,合格的和不合格的数量比是24:1,这批零件的合格率是______%.
24+1=25,
2425×100%=96%;
答:这批零件的合格率是96%.
—People can not only use salt for meals.
—Yes. They also use it to _______ fire. [ ]
A. put on
B. put off
C. put out
D. put down
加热炉点火前必须对煤气进行()。
A、试送气
B、爆发试验
C、打压