企业减少经营的产品线或产品项目的策略称为( )策略。
A.产品线延伸
B.产品线现代化
C.扩大产品组合
D.缩减产品组合
参考答案:D
The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with().
A.An atomic time standard
B.Daylight Savings Time
C.Eastern Standard Time
D.Greenwich Mean Time
为保证蒸馏岗位开车后管线的畅通,应在开车前检查()。
A、系统流程
B、储槽液位
C、真空是否合格
D、系统伴热是否合格