$14.$ Springs subjected to dynamic loading must always be designed with a higher modulus of elasticity to ensure they can absorb and dissipate energy efficiently. $($True$/$False$)$

$15.$ Oxy Acetylene welding's versatility allows it to be used not only for welding but also for $\_$ and $\_,$ making it indispensable in repair and fabrication work. $($True$/$False$)$