对于遗传力较高并且易于测定的性状采用（）选种效果较。 ["合并选择法","家系选择法","个体选择法","家系内选择法"]
病侧呼吸动度减弱伴叩诊为浊音、呼吸音消失者，见于（） ["肺实变","肺气肿","肺不张","气胸","胸膜增厚"]
原始大气中没有什么气体？（） ["甲烷","氢气","氨","氧气"]
患侧呼吸运动减弱，叩诊浊音，可闻及支气管呼吸音者，见于（） ["支气管扩张","支气管哮喘","心源性哮喘","慢性支气管炎","肺炎球菌肺炎"]
个体选择适合（）性状的选择。 ["遗传力高","遗传力低","活体测定难度大","限性"]
官方统计的局限性
