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【单选题】
She won't contact you, ______ something unforeseen happens.A.
as
B.
since
C.
though
D.
unless
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【简答题】(用cut in , cut into ,cut off, cut down填空)The ship was ______ several pieces in the accident
【简答题】假设一信道带宽为4kHz,信道若要达到24kb/s的传输速率,问: (1)按奈奎斯特公式,需要多少个电平表示数据? (2)按香农公式,信道的信噪比是多少倍? 请写出详细的解题步骤
【单选题】听力原文： (24) The Reserve Bank of Australia said yesterday that it would cut official interest rates by 0.5 percentage points to around 7.0 percent, following falls in inflation and in an attempt to help...
A.
Around 7.0 percent.
B.
Around 7.5 percent.
C.
Around 6.5 percent.
D.
Around 0.5 percent.
【单选题】The research team decided to use an underwater saw to cut the ______ ship into sections before lifting it up.
A.
electrical
B.
electric
C.
electricity
D.
electrifying
【简答题】举例说明下列各命题是错误的： (1)若向量组a1，a2，…，am是线性相关的，则a1可由a2，…，am线性表示． (2)若有不全为零的数λ1，λ2，…，λm，使 λ1a1+λ2a2+…+λmam+λ1b1+λ2b2+…+λmbm=0成立，那么，a1，a2，…，am线性相关；b1，b2，…，bm也线性相关． (3)若只有当λ1，…，λm全为零时，等式 λ1a1+…+λmam+λ1b1+…+λmbm=...
【简答题】8051单片机的CPU是 位的。
【简答题】The ship was cut into several pieces in the accident.
【单选题】Gas turbines differ from steam turbines in that ______.
A.
steam rather than gas is used to turn a shaft
B.
vapor rather than gas is used to turn a shaft
C.
the former uses gas to turn a shaft
D.
the latter uses gas to turn a shaft
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