单选题
1分
If there is any doubt as to the proper operation of a radar, which statement is true ?__________.
参考答案: C
参考解析: 假如对于雷达的正常运作有任何的怀疑,哪一陈述是正确的?将雷达所测距离与某一已知物标的实际距离比较可知雷达是否正常