The shipboard oil pollution emergency plan will be invalid after () one year。 two years。 four years。 five year。
试述苗木的防寒措施。
Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the(). Alaska Current。 Subarctic Current。 Kuroshio Current。 Oyashio Current。
LW6型断路器液压操动机构在油压控制保护方面具有哪些动能?
Prior to a ship’s departure, () may not always be tested. fire fighting pump。 the steering gear。 life boat engine。 the main engine。
个人客户经理标准化销售流程中“客户需求分析”不包括()工作内容。