ZFS4000/16/28C中,“C”表示() ["A、插板式","B、充填式","C、铺网式","D、滑移式"]
甲烷在天然气混合物中,其体积分数往往超过() ["90%","20%","30%","50%"]
真菌无性繁殖产生的孢子是()。 ["类囊体","子实体","孢子体","游动孢子"]
下列型号中,属于放顶煤支架的是() ["A、ZFS4000/19/28","B、ZY2600/12/28","C、ZZ2800/7/18","D、ZD4800/17/22"]
我国第一座CNG加气站兴建于()。 ["四川成都","四川南充","四川乐山","陕西西安"]
砂浆标准养护,水泥混合砂浆应在温度(),相对温度为()的条件下养护。