单项选择题
A.1509T B.1509 C.H16C2 D.X16C2
A.1504 B.1505 C.1103T D.1509T
A.1509 B.1510 C.1509T/ST D.1513
A.排放超标/煤气泄露 B.打不着火 C.意外熄火 D.持续工作时间过长
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