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单选题
345、If the. instrument does not operate correctly, do a test. 如果。仪器运行不正常，做个测试
A
Perform a test to confirm if the instrument can operate correctly.
B
If the instrument wasn＇t working properly, perform a test.
C
If a test is performed, then the instrument will be found failed.
答案解析
正确答案：B
相关知识点：
仪器故障做测试
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