Tom and Ann have a dog and a cat. The dog is Tom’s. It’s black. Its name is Peter. The cat is Ann’s. Its name is Gunder.

Tom and Ann are playing with their dog and cat in the room. They put two boxes there. They want to let the dog and cat jump up on boxes. “Jump!” Tom says to the dog. “Jump, Peter! But Peter doesn’t jump. It runs in the room and jumps in Tom. Ann puts the cat on a box. “Stay there, Gunder!” Ann says. But Gunder jumps down and goers away.

“It’s not easy.” Tom says. “No, it isn’t.” Ann says.

What do Tom and Ann have?

A. Tom has a dog. Ann has a rabbit.    B. Tom has a cat. Ann has a dog.

C. Tom has a dog. Ann has a cat.      D. Tom has a box. Ann has a mouse.

2. What do they want the dog and cat to do?

They want them ______________

A. to play each other        B. to jump up on the boxes

C. to play with them        D. to jump down and go away

在使用力矩扳手时，加接加长杆后，施加在紧固件上的力矩值会有什么变化（）

A.增大力矩

B.减少力矩

C.力矩不变

D.费力