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单选题
1612. The isolation valves are identical and interchangeable with each other and with the APU shutoff valve
A
The isolation valves are interchangeable with the APU shutoff valve, so the valves should have the same serial number.
B
The isolation valves and the APU shutoff valve are identical.
C
The isolation valves are identical with each other and with the APU shutoff valve, but you can not change them each other.
答案解析
正确答案：B
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