单项选择题

In order to remove the carbon deposit from the threaded recess, we can use（）

A.a driver
B.a scraper
C.a tap
D.a file

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A.be treated according to the C-Es command exactly
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单项选择题

All items such as steam pipes, exhaust pipes and fittings which, because of their location and operating temperature, present a hazard should be adequately lagged.That means the items should（）

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