单选题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（）Anot be put into operation too earlyBbe pay adequate attention toCbe used only when necessaryDbe coated with certain material
单选题
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（）
A
not be put into operation too early
B
be pay adequate attention to
C
be used only when necessary
D
be coated with certain material
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