【单选题】'How was your weekend?' This question comes up at workplaces all over the United States every Monday morning as people greet each other. It is another way of saying, 'How did you spend your leisure ti...
A.
Because they are interested in the different pastime activities.
B.
Because leisure time is what makes people different from each other.
C.
Because they are bored with the job they have done for the whole week.
D.
Because everybody does the same thing all day long.
【单选题】A foundry produces circular utility access hatches (manhole covers). If 120 covers are produced in a 10-hour shift, the productivity of the line is