1973. If the instrument does not operate correctly, do a test

A Perform a test to confirm if the instrument can operate correctly.

It the instrument wasn＇t working properly, perform a test.

If a test is performed, then the instrument will be found failed.

正确答案：B

设备系统操作理论翻译

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1390. 在上接近面板涂一层密封胶。

1389. 系统内的所有流量控制装置,如单向活门、燃油泵、储压器和继电器均应包括在内。

1388. Documents must be readily revisable

1387. 检查三证(适航证、国籍证、电台证)原件在位、完好、有效。

1386. 未经允许,请勿进入发动机测试区域。

1385. 2mm的数值是被允许的。

1384. From the top sentences, the reader will understand the contents of your text and will find specific information quickly

1383. If the humidity changes frequently, put a cover on the unit

1382. 该信息应与能帮助识别可能超过飞机及其防冰系统认证能力的结冰状况的信息一起提供。

1381. You can also do this test with a locally made tool