在1千克负荷下，弹簧长度由50毫米压缩变成46毫米，试计算该弹簧的刚度为多少牛/厘米？
参考答案：
弹簧的刚度为24.5牛顿/厘米
Beijing announced on Sunday that the date for events ____ the 40th anniversary of the normalization of China-Japan relations would be “adjusted to an appropriate time”.
A．marked
B．marking
C．having marked
D．to be marked
Dreamweaver中（）体现了网页技术从二维空间向三维空间的一种延伸
