Always replace inner and outer wheel bearings on the same wheel at the same. You don't necessarily have to replace the bearings in both wheels at the same time, though it's not a bad idea, but always inner and outer on the same wheel at the same time.
Front rotors on Citroen relay are always replaced in pairs.
Replace the one that is bad if you can figure that out. Sometimes it is hard to determine so if you can afford both do it. If one is bad the next one is not far behind.
Yes. Not only can, but should be.
There is no set time or mileage when to replace automotive springs. It would be when springs are fatigued, cracked or broken. At that point the springs should be replaced in pairs.
No just the bad one.
Experts say they should always be replaced in pairs-like tires. There is bound to be a mismatch between rebound ratings both sides & could adversely affect handling. On the back not as critical since almost all 50/50 & no steering.
The hooves dont go in pairs, so to speak. It usually goes (depending on the leading leg) the back right, the back left, the front left, then the front right, I think. It creates a rocking motion. In the trot, the horses hooves go in pairs, front right and the back left, and the front left and the back right.
In DNA the base pairs are Adenine with Thymine and Guanine with Cytosine. In RNA Thymine is replaced by Uracil so the base pairs are Adenine with Uracil and Guanine with Cytosine.
Pair rules also "nitrogenous bases" are: Adenine pairs with thymine Guanine pairs with cytosine Thymine pairs with adenine Cytosine pairs with guanine In case you are wondering when transcription occurs the top of the deoxyribose double-helix backbone can have thymine. Though on the RNA strand it cannot have thymine, but is replaced with Uracil.
Four (two pairs)
uracil but that's in rna its thymine in DNA
There is not a limit on how many pairs of underwear a guy should own. Some guys have only 7 pairs and some have 50.