工作压力很低,与低压管道输水的地面灌溉相近的灌水方式是()
A. 涌泉灌
B. 滴灌
C. 微喷灌
D. 膜上灌
番茄果实成热大体分为4个时期、即绿熟期、成熟期、转色期和()。
混合式通风主要有长压短抽式、长抽短压式、长压长抽式等几种布置方式。
A. 正确
B. 错误
Where would you find the “call sign” or “call letters”of the radio station on your rig?()
A. In the rig safety manual
B. On the Certificate of Inspection
C. On the Ship Station License
D. On the rig Watch Bill