豌豆潜叶蝇危害特点
参考答案:
主要为害白菜、豌豆等十字花科植物。幼虫潜叶呈蛇形弯曲虫道,虫道内分散颗粒状的粪便。
锅炉设备部件、组件装配中最常用的平台是______。
A.铸铁平台
B.在型钢构架上铺上钢板做成的平台
C.水泥平台
Which of the following options is NOT one of the Key Objectives of NSN Smart Labs?()
A.Should benefit all involved companies.
B.Attract public interest.
C.Invite Competition.
D.Open for all developers and all operators.