Select boards allowing optical protection from the following options. ()
A、OP
B、OPCS
C、OPMS
D、SWE
E、OPM
F、OMCP
A、OP
B、OPCS
C、OPMS
D、SWE
E、OPM
F、OMCP
A、Enquire the health conditions on board. B、Enquire the safety conditions on board. C、Enquire the loading conditions on board. D、Enquire the fire conditions on board.
A、A.distribution boards B、B.section boards C、C.emergency switch boards D、D.main switch boards