Technician a says oily residue on hoses, components, or fittings indicates an area where refrigerant may be leaking. technician b says that low coolant level will result in the water pump only heating the engine, not the inside of the car. who is correct?
neither technician a nor b
b. technican b
c. both technicians a and b
d. technician a

Option D.

Technician A.

Explanation:

Oil residues on hoses, it's components or fittings indicate an area where refrigerant may be leaking.

An oil spot on the A/C hose is an indication of refrigerant leak in the system. Good oil levels are important for the system good performance. If the level of oil is to low, the compressor will not have lubrication and if it is too high, the heat exchange will affected which will lead to poor air conditioning performance. If a leak is formed on A/C hose, an oil spots that collect dirts will disappear. An refrigerant leak detector will help verify if there is no leak in the system.

So Technician A is correct.

the answer is d.) homologous; have mammary glands

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.