exhaust will be smoky

piston rings would stick into piston grooves

scavenging occurs

engine starts overheating

Changing the audio frequency

Interrupting radio signal

Using microphone

Using microphone

Tubular centrifugal

Clarifier

Sparkler filter

Vacuum leaf filter

Two valence electrons

Three valence electrons

Four valence electrons

Five valence electrons

U.S.A.

U.K.

U.A.E

Japan