142. What statement is true concerning diesel engines, such as those used for main propulsion and auxiliary power on tugboats?

Diesel engines are rotary, internal combustion engines using the heat of compression to achieve ignition.
Diesel engines are reciprocating, external combustion engines using the heat of compression to achieve ignition.
Diesel engines are reciprocating, internal combustion engines using an electric spark to achieve ignition.
Diesel engines are reciprocating, internal combustion engines using the heat of compression to achieve ignition.

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