"several key technologies" is correct and usable in written English.
For example: "We must understand several key technologies in order to make progress in this field."
The last decade has seen dramatic reductions in latency for several key technologies in computing.
IDSS-MSSATPP involves several key technologies and methods such as knowledge representation and case matching.
Several key technologies such as process design and quality control, tool fabrication, and process simulation are illustrated.
Then, several key technologies are introduced to improve the performance of GrSi solar cells, such as chemical doping, annealing, Si surface passivation and interlayer insertion.
Several key technologies (such as three-dimensional seismic survey and micro-seismic monitoring of fracturing, horizontal wells, "factory-like" or industrialized production mode, etc).
IKAROS was injected to an Earth Venus trajectory to demonstrate several key technologies for solar sail utilizing the deep space flight environment.
There are several key technology areas involved in the design of Ethernet-based industrial automation architecture.
Several key manufacturing technologies have been developed for the fabrication of the HCPB BU.
This is due to several emerging key technologies.
The task force also complained that the city had asked the commission — without receiving an answer — about reclassifying several "key information technology titles" to exempt them from the civil service exam requirement.
Several of the key technologies that made Advanced LIGO so much more sensitive have been developed and tested by the German UK GEO collaboration.
