两个采用变型补码表示的数进行加减运算时，发生负溢出的特征是双符号位为( )。A．01

读一读，做一做。

      Hi, I'm Liu Jie. I' m going to have a busy weekend! On Saturday, I'm going to the bookstore by subway.

I'm going to buy a new CD and some story-books. Then, I'm going to go home and read the new books. On

Sunday, I'm going to the market with my mother. In the evening, I'm going to visit my aunt. We're going to

watch TV together.

On Saturday: ___________________________________________________________________

On Sunday: ___________________________________________________________________

—Who can I bring to the meeting, Mr. Green?  

—I don't mind whether your mother or your father attends, you can bring _____ of them.[ ]

A. either

B. neither

C. each

D. every

体育课上小伟和小强进行爬绳和爬杆比赛，小伟爬绳小强爬杆。若两人体重相同，且同时匀速向上爬，则小伟受到的绳的摩擦力______ （填“大于”、“小于”，或“等于”）小强受到的杆的摩擦力。

第四次十字军东征中，东征军队抢劫了哪个城市（）

A、君士坦丁堡

B、布达佩斯

C、开罗

D、耶路撒冷