Words to Describe thyristors

How thyristors often is described ("________ thyristors")

• upper
• off
• asymmetrical
• antiparallel
• high
• activated
• most
• type
• various
• several
• matched
• parallel
• power
• grade
• state
• voltage
• normal
• additional
• unidirectional
• speed
• conventional
• ordinary
• main
• appropriate
• auxiliary
• low
• optical
• positive
• bidirectional
• connected
• controlled
• poled
• triggered
• back
• available
• current
• large
• other
• individual
• standard
• area