SAN FRANCISCO, Feb. 6 (Xinhua) — The U.S. National Transportation Safety Board (NTSB) said on Tuesday in its preliminary investigative report that four key bolts were \”missing\” when a door plug blew
Enjoy life, Inspiring work
Enjoy life, Inspiring work
SAN FRANCISCO, Feb. 6 (Xinhua) — The U.S. National Transportation Safety Board (NTSB) said on Tuesday in its preliminary investigative report that four key bolts were \”missing\” when a door plug blew