带传动正常工作时不能保证准确的传动比是因为()。
A.带的材料不符合虎克定律;
B.带容易变形和磨损;
C.带在带轮上打滑;
D.带的弹性滑动。
参考答案:D
阅读短文,判断正误。正确的写T,错误的写F。
My name is Wu Dong. I'm eleven. I'm a student. I'm thin and short. I like music. I have a friend. His name
is Wu Ping. He's a good boy. He's tall and strong. He likes sports. He likes painting, too.
( ) 1. I'm Wu Dong. I'm a student.
( ) 2. Wu Dong is tall and strong.
( ) 3. Wu Dong likes sports.
( ) 4. Wu Ping is short and strong.
( ) 5. Wu Ping likes painting.
下列关于Java语言特点的叙述中,错误的是( )。
A.Java是面向过程的编程语言
B.Java支持分布式计算
C.Java是跨平台的编程语言
D.Java支持多线程