Kedu ihe bụ ọkwa izugbe nke igbe ihe mgbawa

Ogo mkpuchi mgbawa na-anabatakarị n'ụlọ nrụpụta bụ IIB na IIC.

A na-ekewa ngwaahịa na-egbochi mgbawa ụzọ abụọ, dI na dIIBT4:

A na-ahọpụta dI maka ebe ndị na-abụghị ndị na-egwupụta ihe n'ebe a na-egwupụta kol.
dIIBT4, eji na ntọala nrụpụta, dabara adaba maka ngwakọta gas na-agbawa agbawa n'okpuru klaasị IIA na IIB, site na otu T1 ruo T4. Ngwaahịa a na-agbaso ụkpụrụ ọkọlọtọ JB/T8528-1997 chọrọ. Ụdị ihe mgbawa kwekọrọ na ọkọlọtọ GB3836.1-2000 yana ọkọlọtọ JB/T8529-1997.