Tech A says that hydraulic braking systems use proportioning valves and metering valves. Tech B says that hydraulic braking systems use pressure differential valves, or anti-lock hydraulic control units to modify hydraulic pressure. Who is correct?

A) Tech A
B) Tech B
C) Both Techs A and B
D) Neither Tech A nor B

Option C) Both Techs A and B

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

the answer is a 3.8cm

explanation: