The cover board generally used between a single -ply roof membrane and rigid board insulation is

A) specially treated perlite board.
B) iso board.
C) extruded polystyrene board.
D) glass-fiber-reinforced gypsum board.
E) none of the above.


D) glass-fiber-reinforced gypsum board.

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What does a variable timing device such as Econovance allow an ECM managing a Bosch 8500 injection pump to control?

A. exact moment of ignition B. injection timing advance C. centrifugal timing advance D. engine cylinder pressure

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Which class of organic toxins is often intentionally applied to soils?

A) refrigerants B) preservatives C) pesticides D) fuels E) plasticizers

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Which torch type would be the best choice for a brazing project?

A) Air-fuel torch B) Air-MAPP swirl-tip torch C) Oxyacetylene torch D) Air-propane swirl-tip torch

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