Among the main propulsion units on board the ship with the same capacity, the lightest one is_____.

The construction of the main propulsion engine lube oil sump should .A.have no plating joi

The opening of an exhaust valve on a modem, large, low－speed, main propulsion diesel engin

Which of the following is NOT among the five biggest cities in the United States？A．Chicago

Among the five Great Lakes, only Lake______is wholly within the United States.A．ErieB．Supe

Among the five Great Lakes, which one is wholly within the United States？A．Lake Erie.B．Lak

The United States of America is among the top 10