由于贫乏而（）种群生长的资源被称为（）。
A revised print of a chart is made （）. after every major hydrographic survey of the area covered by the chart。 when there are numerous corrections to be made or the corrections are extensive。 when a low-stock situation occurs and minor corrections are made。 every two years to update the magnetic variation informatio。
简述脂肪瘤。
The shells are secured by means of bearing caps and studs, the necessary clearance being provided by means of （） of different thickness. shims。 packing。 glands。 washer。
划桨时，担任头浆的是（）。 船长。 划桨技术较好，有独立处理问题能力的。 力气大的。
下列年金可以计算终值（）
