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【判断题】
G653和G655类光纤是国内常用的光纤,G652和G654类光纤在国内使少使用。
A.
正确
B.
错误
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举一反三
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A.
HLB值在1~3
B.
HLB值在3~8
C.
HLB值在7~9
D.
HLB值在9~13
E.
HLB值在13~18
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A.
HLB值在1~5
B.
HLB值在3~8
C.
HLB值在7~9
D.
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E.
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