Email format error
Email cannot be empty
Email already exists
6-20 characters(letters plus numbers only)
The password is inconsistent
Email format error
Email cannot be empty
Email does not exist
6-20 characters(letters plus numbers only)
The password is inconsistent
The strength and hardness of aluminum alloys has a certain positive relationship. Pure aluminum has the lowest strength, while 2-series and 7-series heat-treated alloys have the highest strength.