Sailing directions are kept up to date by ______.

Valves in the cylinder head of a diesel engine are opened by the direct action of the ____

Line losses in a distribution circuit are kept to a minimum by _____.A.adding rubber insul

____ is （are) not power supplied by main switchboard directly.A.Steering gear and windlass

You can ______ your muscles more powerfully by linking up your breathing to the exercise.A

This act is enacted by the parliament, and shall come into______on a date to be fixed by p

______personally directed the action by using the army to drive a few hundred WW I veteran