闭锁卵泡液中() ["雄烯二酮含量高","LH含量高","雌激素含量高","孕激素含量高","雌、孕激素含量均高"]
世界上第一个拥有双价抗虫棉的国家() ["美国","中国","日本","英国"]
可采用挡墙土进行()避免坡面扰后的回填土流失。 ["护坡","护底","坡脚防护","坡面防护"]
()误差服从统计规律,它出现正负误差的几率相等,可以通过多次测量,采用统计学求平均的方法来消除。 ["系统误差","随机误差","粗大误差","疏失误差"]
登记
建设节水型社会如何“坚持政府主导,全民共同参与”?