【单选题】
A 1) A. OAM-MAPPING方案要求BSC是MSP 1+1方式，单向1+1和双向1+1均可以。OAM-MAPPING scheme requires that BSC should be in MSP 1+1 mode, either unidirectional 1+1 or bidirectional 1+1.
B 2) B. OAM-MAPPING方案要求PW 配置1：1 单发双收方案。OAM-MAPPING scheme requires PW to configure 1:1 single transmission and concurrent reception scheme.
C 3) C. OAM-MAPPING方案要求PW 配置1+1 双发单收方案。OAM-MAPPING scheme requires PW to configure 1+1 concurrent transmission and single reception scheme.
D 4) D. 该场景在和bsc正确接时，PTN侧断发纤，PTN也会执行倒换动作。Under this scenario, in the case of interconnection with bsc, the transmission fiber is interrupted at PTN side. PTN also performs the switchover action.
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