The design of the system allows __ easy upgrades.

The Internet of Things operating system AliOS Things does not support air upgrades.

中国大学MOOC: Anyone ______ upgrades their professional knowledge to a new level can apply for these courses.

中国大学MOOC: 20. Anyone ______ upgrades their professional knowledge to a new level can apply for these courses.

The total cost of owning technology resources includes costs for hardware and software upgrades, maintenance, technical support, and training.