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?

（） is not properly set thus causing either advanced or retarded firing.

The （） is not properly set thus causing either advanced or retarded firing.

Children who are not active or ______ diet is high in fat will gain weight quickly.

（） are individuals and organizations that are actively involved in the project, or whose interests may be affected as a result of project execution or project completion.

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

In deciding to detain a ship or not, the PSCO would better not（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

are individuals and organizations that are actively involved in the project，or whose interests may be affected as a result of project execution or project completion．

（） rods are not in proper condition so that too much fuel is supplied to the corresponding cylinder.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。