●Communication networks can be classified in terms of their physical arrangement or (73) Three common (73) are the star,bus,and ring.

●Communication networks can be classified in terms of their physical arrangement or (73) Three common (73) are the star,bus,and ring.

Where tanks are arranged for either oil or ballast （） must be fitted in the pipe so that only the ballast main or the oil transfer main connected to the tank.

The students in a certain physical education class are on either the basketball team or the tennis team, are on both these teams, or are not on either team. If 15 students are on the basketball team, 18 students are on the tennis team, 11 students are on both teams, and 14 students are not on either of these teams, how many students are in the class?

The students in a certain physical education class are on either the football team or the basketball team, are on both these teams, or are not on either team. If 12 students are on the football team, 15 students are on the basketball team, 8 students are on both teams, and 9 students are not on either of these teams, how many students are in the class?

These are the principles, however formulated, for which all good men and women throughout the world,（）of race or creed, education, social position, or occupation, are standing.

Cast iron carrier rings, （） machined grooves, are provided for all the pistons.

When latitude and longitude are used，these shall be expressed in（）（and decimals of a minute if necessary），north or south of the Equator and east or west of Greenwich.

The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）

The goal, which they are unlikely to live to see , is tocure, prevent or manage all diseasesin the next 80or so years.

These piston rings are so badly worn that they must be （）.

The cooling of the piston is carried out by circulating （） across the underside of the crown and inside the ring belt or through specially shaped passages.