Propeller running at ____ are generally efficient.A.high speedsB.medium speedC.low speedsD

You are on a single－screw vessel with a right－handed propeller.The vessel is going full speed astern with full right rudder.The bow will swing ______.

When the propeller blades are integral with the hub, the propeller is called a _____.A.bui

The company is run at a loss. Certain problems were ______ from the outset.A、apparatu

Was it just a（n)______ that John and she had met at the market for three days running, or

We will soon ____ natural resources if we keep exploiting them at such a rate.A: run

The national parks are very important for preserving many animals, who would ______run the