设备最佳更新期是______。
A．使用寿命 B．经济寿命 C．技术寿命 D．自然寿命
参考答案：B
解析： 设备经济寿命也称“设备最佳更新期”。
266. At first he did not realize that he had succeeded in making a computer that ran on solar power(太阳能). “Realize” in the sentence means “___________”
A．understand
B．get to
C．reach
D．come true
群植在构图上作配景或夹景用.
