勘探阶段划分地区地层及与相邻地区统层的依据是:()
A. 岩石地层单元
B. 生物地层单元
C. 地震反射层位
D. 测井地层单元
焊工必须戴有绝缘手套才能操作焊接,不准光着手换焊条。
A. 正确
B. 错误
个人网银批量转账单次转账总金额不得小于总笔数的()倍。
A. 10
B. 20
C. 50
D. 100
When anchoring in open anchorage, chief engineer should consult with captain ()
A. if the ship must be stand by
B. if M-E should be stopped
C. if keep-watching as in voyage
D. if the ship must anchor two anchor