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【单选题】
_____it raintomorrow, we would have to put off the visit to the Yangpu BridgeA.
were
B.
should
C.
would
D.
will
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举一反三
【单选题】Unless economic conditions improve, there ______ widespread unrest in the United States.
A.
is
B.
will be
C.
would be
D.
were fighting
【简答题】设Ax=b，其中A∈R n×n 为非奇异阵，证明： (a)A T A为对称正定矩阵； (b)cond(A T A) 2 =[cond(A) 2 ] 2 .
【简答题】在2ASK系统中,基带信号的码元传输速率为32K波特,则该2ASK系统所需的传输带宽为( )。