A.不大于2.7 B.不小于2.7 C.不大于3 D.不小于3
A.1 B.2 C.3 D.4
A.1/2 B.1/3 C.1/4 D.1/5
A.40W B.50W C.60W D.80W
A.JWXC-H340 B.JWXC-H660 C.JWXC-H310 D.JWXC-H125/80
