【单选题】齿轮传动的特点主要有: 准确,传递功率、 速度范围大,传动效率高,寿命长,体积小,但易冲击振动有噪音,不宜远距离传动,且成本高。
【单选题】How did scientists determine the age of the universe?
A.
By observing the oldest stars in the universe.
B.
By studying the nearest stars that can be seen.
C.
By fixing the age of the oldest stars in the Galaxy.
【判断题】同样的生产条件下,预定较大的刀具寿命值,则应选择较小的切削用量。
【单选题】It is ______ that you want to pass the examination with the down-loaded thesis.
【单选题】It is ______ that you ware to pass the examination with the down loaded thesis.
【单选题】Listen to Track 69.
A.
Very few students are asked to consider writing an honors thesis.
B.
The woman has shown poor research skills in the past.
C.
An honors thesis could help the woman get into law school.
D.
The woman should write a proposal outlining her research skills.