Emulsion oils and sodium nitrite are both approved additives， but the latter cannot be used if any pipes are （） or if any soldered joints exit.
举一反三
- If no gaskets are used in the piping joints of a Freon system, the joints must be（） A: finished joints B: welded joints C: ground joints D: soldered joint
- cutting fluidscommonly used are A: extreme pressure emulsion or an anti-corrosion emulsion B: Emulsions C: Cutting oils D: Water solutions
- We use no ________(art) additives of any kind in our products.
- What factors can increase the force onthe walls of the pipes in any piping systems A: Narrower pipes B: Thicker pipes C: The properties of fluid D: Extra fluid
- (When used. as food (additives), antioxidants prevent fats and oils from (become. rancid when exposed to air, (and thus) extend their shelf life. A: When used B: additives C: become D: and thus