板料在弯曲时，一般经过以下两个阶段：⑴弹性弯曲阶段。⑵塑性弯曲阶段。
Variation is not constant; it is different with every change in（）. speed。 vessel heading。 geographical location。 cargo。
用专用弯曲设备如折弯机、滚弯机等进行特殊形状的弯曲。这种方法主要是用弯曲大、中型零件的批量生产。
利用冲模在压和机上把板料的一部分与另一部分分离的加工方法，称为冲裁。如我们常见的修边、切口、冲孔等。
Unless it is specially agreed otherwise，the adjustment of the claims to contribution takes place（）and is governed by the law of the place of delivery of the cargo. before the conclusion of the voyage。 after the conclusion of the voyage。 as soon as the expenditure occurs。 before or after the conclusion of the voyage。
关于关键路径错误的说法是（）
