水的平均CT值正常波动范围不应超过
A．±1HU
B．±2HU
C．±3HU
D．±4HU
E．±5HU
参考答案：C
1t was so lucky that I came across my old friend _____ I came to this
company. [ ]
A. the first time
B. every time
C. for the first time
D. at times
在抢截球技术动作结构中实施抢截球技术成功的首要因素是（）。
A、判断与选位
B、抓住时机
C、与下一动作的衔接
D、破坏
