.service-item{
    background-repeat: no-repeat;
    background-size:cover;
}

.service-item1{
    background-image: url("../dc/航天.png");
}

.service-item2{
    background-image: url("../dc/航空.png");
}

.service-item3{
    background-image: url("../dc/核能.png");
}

.service-item4{
    background-image: url("../dc/船舶.png");
}

.honour-item1{
    background-image: url("../dc/组 1.png");
}

.honour-item2{
    background-image: url("../dc/组 2.png");
}

.honour-item3{
    background-image: url("../dc/组 3.png");
}

.honour-item4{
    background-image: url("../dc/组 4.png");
}

.item_img_content{
    height: 76px
}

.software{
    display:flex;
    text-align: center;
    margin: auto;
    width: 1169px;
    height: 1100px;
    background-repeat: no-repeat;
    background-size:cover;
    background-image: url("../dc/软件shuoming .png");
}

.dc-map{
    height: 380px;
    width: 540px;
    background-image: url("../dc/map.png");
    background-repeat: no-repeat;
    background-size:cover;
}

#mcontact{
    background-repeat: no-repeat;
    background-size:cover;
    background-image: url("../dc/bgmap.png");
}