齿轮减速器在使用中的主机损坏形式是齿轮失效。
金属在干燥条件下或理想环境中不会发生腐蚀。
Which statement is true？（） A flow layout can be used to position a component that should resize horizontally when the container is resized.。 A grid layout can be used to position a component tat should maintain a constant size even when the container is resized.。 A border layout can be used to position component that should maintain a constant size even when the container is resized.。 The grid bag layout can be used to give a grid-like layout which differs from the normal grid in that individual rows and columns can have unique sizes.。 If two components are placed in the same column of a grid bag layout， and one component resizes horizontally， then the other component must resize horizontally.。
单主梁桥、门式起重机的小车架上应设置防倾翻安全钩。
通常情况下，磁选方法难于回收（）的磁性矿物。 粗粒。 微细粒。 细粒。 较细粒。
为新开帐户进行方案策划时，需要（）
