震源距
参考答案:
某一指定点至地震震源的距离。
It was in 1969 ___ the American astronauts first succeeded in landing on the moon.[ ]
A. that
B. when
C. which
D. in which
故障管理信息表中,下列哪项是自动提取,不需要填写的?()
A.故障现象;
B.故障原因;
C.设备名称;
D.进展状态。