I have uniform in my roomd在uniform前填什么冠词A an B a c some

I have uniform in my roomd在uniform前填什么冠词A an B a c some uniform前+a还是an a uniform还是an uniform "a uniform" or "an uniform"? 在英语里,是a uniform,还是an uniform We have to wear _____ uniform to school.A.a B.an C.the D./ 我 a还是an uniform The man ______police uniform is my uncle.A.on B.in C.wear D. That is ___ uniform of our school.A.the B.an C.a D./ we have to wear a uniform .( ) A haven't we B don't we C hav 请问uniform distribution均匀分布 UNIFORM(a,b,c)中的三个参数都是什么意思? 请问uniform的前面在什么情况下用a在什么情况下用an?