问题
单项选择题
关于弹簧的劲度系数k，下列说法中正确的是（）
A.与弹簧所受的拉力大小有关，拉力越大，k值也越大
B.由弹簧本身决定，与弹簧所受的拉力大小及形变程度无关
C.与弹簧发生的形变的大小有关，形变越大，k值越小
D.与弹簧本身特性，所受拉力大小，形变大小都无关
答案
参考答案：B
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关于弹簧的劲度系数k，下列说法中正确的是（）
A.与弹簧所受的拉力大小有关，拉力越大，k值也越大
B.由弹簧本身决定，与弹簧所受的拉力大小及形变程度无关
C.与弹簧发生的形变的大小有关，形变越大，k值越小
D.与弹簧本身特性，所受拉力大小，形变大小都无关
参考答案：B
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2. I need to see the person _____ is responsible for the project. 3. I know the man _____ bike was stolen yesterday. 4. I will remember those days _____ we were together. 5. I want to buy the fruits _____ are fresh and cheap. 6. Tell me _____ you were talking with on the phone when I opened the door. 7. This is the place _____ Confucius was born. |