问题
填空题
被举高的重锤具有 ______能；拉弯的弓具有 ______能；被压缩的弹簧具有 ______能．
答案
重锤因为在高处，所以具有重力势能；拉弯的弓和压缩的弹簧都发生了弹性形变，虽然没有做功，但却具有弹性势能；
故答案为：重力势；弹性势；弹性势．
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被举高的重锤具有 ______能；拉弯的弓具有 ______能；被压缩的弹簧具有 ______能．
重锤因为在高处，所以具有重力势能；拉弯的弓和压缩的弹簧都发生了弹性形变，虽然没有做功，但却具有弹性势能；
故答案为：重力势；弹性势；弹性势．
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| Billy is a boy of fifteen. His parents died three years ago. One day when he was walking in the street, he 1 a wallet. He returned it to the owner, Mr Baker. He gave his 2 to the boy. As the boy had no job, Mr Baker made him work for him in his 3 . Billy worked so hard that Mr and Mrs Baker were 4 with him. Mr Baker loved planting 5 . The week before last, he brought a few trees home, planted them in the 6 himself and watered them every day. Several days 7 , he had to leave for another city. Before he started, he said to Billy. "Take good care of the trees. Some boys near our house always want to steal (偷) them." "Don't 8 about them, sir." answered Billy, "I'll try my best to watch them." Six days passed and Mr Baker came back. He asked, " 9 anyone ever come to steal the trees?" "No, sir." Said Billy, "To stop someone from stealing the trees, I 10 them up six days ago. I have hidden (藏) them for almost a week!"
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