According to the passage, what could be immediately ruled out as a cause of the crash landing of Asiana Flight 214 at San Francisco Airport?
A. Terrorism
B. Pilot errors
C. Mechanical failure
D. Weather conditions
查看答案
According to Debarah Hersman, why do so many people feel thankful after the terrifying crash landing?
A. Because all the people on board survived, only some injured.
Because so many people on board survived, only two dead.
C. Because so many people on board were injured, no one dead.
D. Because all the people on board were injured, only two dead.
According to the news, what will the NTSB team do for the investigation on the crash landing of Asiana Flight 214?
A. It will conduct interviews with the pilots.
B. It will obtain the cockpit voice recorder and flight data recorder.
C. It will come to look at the accident aircraft.
D. It will fly out to the crash site from Washington.
About Asiana Flight 214 crash-land at San Francisco Airport, which of the following statements is NOT true?
A. It is premature to say what caused the crash landing of Asiana Flight 214.
B. The inexperienced pilots were viewed as the main reason for the crash landing.
C. Two fatalities in the crash were identified as female teenagers from China.
D. The NTSB began its work on investigating on the exact cause of the crash landing.
AT89S51采用12MHz的晶振，定时1ms，如用定时器方式1时的初值（16进制数）应为多少？
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