《民用航空器加油规范》要求，加油车管线材质不能使用（）材料。
A.铝合金
B.不锈钢
C.铜合金
D.内表层经热镀锡防护的中碳钢
参考答案：C
最容易导致急性化脓性眼内炎的球内异物是
A．玻璃B．石块C．铜异物D．塑料异物E．铁异物
Playing sports is a good way to have fun.Kangkang often _____小题1:____(go) to the school gym to do sports.Last Saturday,Kangkang _______小题2:____ (go) to the gym with some of his classmates. They ____小题3:___ (have) great fun swimming and playing basketball.
小题1:
小题2:
小题3:
It is Friday today. Look！Kangkang and Michael ______小题4:____ (play) table tennis while Lily is learning to skate.What will they do tomorrow? They ____小题5:______ (go) to the zoo. They will be very happy！
小题4:
小题5:
