《民用机场多普勒天气雷达系统技术规范》要求:雷达发射机应当具有至少()发射脉冲宽度的能力,以适应不同的探测模式。
参考答案:两种
— Many people in big cities cannot enjoy life even though they have houses, cars and ideal jobs .
— Sub-health may partially ______ it. [ ]
A. account for
B. call for
C. answer for
D. stand for
脊柱活动度检查(图2-1-53)。