Are"stagger," "limp," "stride" and "stumble"muchmore concrete than "walk‘’? A: Yes B: No

After he was attacked, he managed to ________ to the phone and call for help. A: pound B: turn C: stabber D: stagger

为了解决探测距离和距离分辨力的矛盾，一次雷达采用以下哪种技术（） A: 波束切换 B: STAGGER C: 频率分集 D: 脉冲压缩