单项选择题
A.（－∞,0）∪（0,＋∞）B.（－∞,－2]C.[－3,0）∪（0,＋∞）D.（－∞,0）∪（0,2）
Which vibration signal will be sent to the flight compa...
单项选择题Which vibration signal will be sent to the flight compartment for each engine on B737-300 aircraft? ( )
A.（－3，－2]∪（1，＋∞）B.（－3，－2]∪[1，2）C.[－3，－2）∪（1，2]D.（－∞，－3]...
