This describes a characteristic of a gas lens:gas lens.
A) Gas flows in a smooth-flowing solid column.
B) The gas swirls around inside the cup.
C) Turbulence pulls atmosphere into the column.
D) Having 4-5 holes through which the gas is diffused.
Question 2
Combination gas valves used standing pilot furnaces combine
A) Pressure regulation, automatic gas control, and pilot safety
B) Pilot safety, fan control, and gas pressure regulation
C) The transformer, gas valve, and fan relay
D) Gas heating control, fan operation, and air conditioning sequencing
Hartmann's mountain zebra resting, showing its characteristic essentially unbarred belly
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