[单选题]_____ shows 1.2 meter and the specific gravity of the oil is 0.96According to the measuring scale, that makes 150 tons.

正确答案 ：C

The sounding rod

[单选题]Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.

正确答案 ：D

combustible gas indicator

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