uniform前+a还是an

uniform前+a还是an a uniform还是an uniform a还是an uniform 在英语里,是a uniform,还是an uniform uniform 前加的是a还是an ,哪umbrella 呢 "a uniform" or "an uniform"? 是He'got a uniform.还是He's got an uniform? "uniform"的前面是加"a",还是加"an"? wear a uniform 还是wear uniform I have uniform in my roomd在uniform前填什么冠词A an B a c some wear a uniform为什么不用an hour前用a还是用an