评定母材焊接性能的好坏

研制新的焊接材料

确定合适的焊接工艺参数

确定焊缝金属 的化学成分

评定母材焊接性能的好坏

研制新的焊接材料

确定合适的焊接参数

确定焊缝金属的化学成分

自承诺作出之时起生效

自承诺发出之时起生效

自承诺到达要约人时生效

自要约人了解承诺内容时生效

正确

错误

Intermediate filaments have great strength, and their main function is to enable cells to withstand the mechanical stress that occurs when cells are stretched. The filaments are called “intermediate” because, in the smooth muscle cells where they were first discovered, their diameter (about 10 nm) is between that of the thinner actin filaments and the thicker myosin filaments.

Intermediate filaments are the toughest and most durable of the cytoskeletal filaments: when cells are treated with concentrated salt solutions and nonionic detergents, the intermediate filaments survive, while most of the rest of the cytoskeleton is destroyed.

Intermediate filaments are found in the cytoplasm of most animal cells. They typically form a network throughout the cytoplasm, surrounding the nucleus and extending out to the cell periphery. There, they are often anchored to the plasma membrane at cell–cell junctions called desmosomes, where the plasma membrane is connected to that of another cell.

Intermediate filaments are also found within the nucleus of animal cells. There, they form a meshwork called the nuclear lamina, which underlies and strengthens the nuclear envelope. In this section, we see how the structure and assembly of intermediate filaments makes them particularly suited to strengthening cells and protecting them from tearing.

正确

错误

intermediate goods are not valuable.

intermediate goods are not useful to consumers.

that would count the intermediate goods twice.

that would understate the true size of GDP.

正确

错误

焊接工艺参数是否合适

焊接接头强度是否符合设计要求

焊接 接头是否容易产生热裂纹

焊接接头塑性是否符合设计要求