Question

to meet common standards, we have to inspect all of the following except
water supply and distribution system
waste disposal systems
drain piping
vent piping
chimneys for water heaters
question 48
galvanized steel pipe typically fails first at
threaded connections
elbows
the top sides of long horizontal runs
vertical runs
bends in the pipe

Explanation:

For the first question, water - supply, waste - disposal, drain and vent piping are common inspection items for meeting standards, while water - heater chimneys are not among the typical ones for general standards inspection. For the second question, galvanized steel pipes often fail first at threaded connections due to stress concentration and potential for corrosion at the threads.

Answer:

First question: chimneys for water heaters
Second question: threaded connections