【单选题】正弦电压 u( t)=50sin(314 t +60 o )V, 则该正弦电压的周期 T 为 。
【简答题】一般 Java 程序的类主体由两部份组成:一部分是 ,另一部分是 。
【单选题】Which of the following statements is TRUE according to the passage?
A.
Many fields of science and technology are now using CAD and CAM.
B.
High technology is nothing but a new type of teamwork plus CAD and CAM.
C.
The author gives some details in the passage about barriers between traditional design and manufacturing function.
D.
Experts from different fields have to cooperate to develop a product from concept to production.
【单选题】正 弦 电 压 u =10 sin ( 314 t + 30 ° ) V, 其角频率为
【单选题】All the following are mentioned in the passage as reasons why children should learn science EXCEPT ______.
A.
making better sense of things around them
B.
improving their decision-making ability
C.
cultivating their problem-solving ability
D.
developing their total personality