下列()是木屋架的计量单位。
A. 榀
B. m3
C. m2
D. m
E. t
词汇与结构In flight, loss of control is the biggest single _________ of transport aircraft fatal accidents.
A. risk
B. consequence
C. result
D. cause
词汇与结构Loss of control in flight has been one of the most _________ causes of fatal aircraft accidents for many years.
A. considerable
B. significant
C. unchanged
D. tangible
词汇与结构Loss of control usually occurs because the aircraft enters a flight regime which is outside its normal ________, thereby introducing an element of surprise for the flight crew involved.
A. limitation
B. condition
C. envelope
D. situation