問題文
A design that keeps older working machines in place has to say which parts move up and which stay behind, and how many older builds may be in force at once and what bars a further one. Which of the four statements is right?
選択肢
- The parts left standing on the older build is all of them but the machines that carry out the work, the parts moved up to the newest build in this arrangement is the machines that carry out the work, and no others, the bar met when a further one is wanted is that one of the pair has to be dropped before a third is picked, and the count of older builds that may be in force together is a pair of them, and never a third standing at the same time.
- The parts left standing on the older build is all of them but the machines that carry out the work, the parts moved up to the newest build in this arrangement is the machines that carry out the work, and no others, the bar met when a further one is wanted is a pair of them, and never a third standing at the same time, and the count of older builds that may be in force together is that one of the pair has to be dropped before a third is picked.
- The parts left standing on the older build is the machines that carry out the work, and no others, the parts moved up to the newest build in this arrangement is all of them but the machines that carry out the work, the bar met when a further one is wanted is that one of the pair has to be dropped before a third is picked, and the count of older builds that may be in force together is a pair of them, and never a third standing at the same time.
- The parts left standing on the older build is the machines that carry out the work, and no others, the parts moved up to the newest build in this arrangement is all of them but the machines that carry out the work, the bar met when a further one is wanted is a pair of them, and never a third standing at the same time, and the count of older builds that may be in force together is that one of the pair has to be dropped before a third is picked.