Y3150E上滚切斜齿圆柱齿轮时,合成运动机构有2个运动输入端,2个运动输出端。When cutting helical gear on Y3150E, the motion synthesis mechanism has two motion input terminals and two motion output terminals.
【单选题】听力原文: Washington All eyes are focusing on Las Vegas as the sporting goods industry closes in its first true industry gathering in years. The much anticipated spring market will make its debut June 11t...
A.
A trade show of the latest sporting goods is on display.
B.
An event for team sports is held with the country's best athletes.
C.
A spring market fair for cutting equipment and accessories is open.
D.
A business rendezvous is scheduled between VIPs and the best athletes.
【单选题】听力原文: Most people are aware, that the earth is a delicate thing, and that it cannot last forever, if we do not take care of it. Apart from the dangers of blowing each other up, there is the problem of...
A.
The earth cannot last forever, if we do not take care of it.
B.
Hunters are destructing the wildlife.
C.
Nuclear power is increasingly used to generate electricity.