当物体有滑动趋势而尚未滑动时的摩擦称为()。
A.动摩擦
B.静摩擦
C.滚动摩擦
D.正摩擦
参考答案:B
阅读短文,根据短文内容判断正误,正确的写"T",错误的写"F"。
Today Amy and I go to the bookshop by bike. Amy wants to buy a new comic book.l want to buy an
English book. At the bookshop we see many people there. We can't find the books.
( ) 1. Amy and I go to the zoo today.
( ) 2. I want to buy a comic book.
( ) 3. We buy two books.
将八进制的256转换为十六进制是( )。
A.AE
B.BE
C.AD
D.BD