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【单选题】
49开发新产品通常要经历:1.产品初步设计2.产品构思3.筛选4.试制5.可行性研究6.试销7.正式投产和上市等七个环节,下列按先后顺序排列正确的是( ).A.
2134567
B.
2135467
C.
2315467
D.
2513467
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举一反三
【单选题】The universe began with the Big Bang 13.7 billion years ago, with everything___ in space smaller than a grain of sand.
A.
started
B.
starting
C.
to start
D.
to be started
【单选题】He had little idea that it was getting so late, _____________?
A.
didn't he
B.
wasn't it
C.
did he
D.
was it
【单选题】Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, ______ happened about 13.7 billion years ago.
A.
that
B.
which
C.
when
D.
what
【单选题】下列关于信息的特性的描述中，错误的是(12)。
A.
信息是有价值的
B.
信息能够以不同的形式进行传递，还原再现
C.
信息必须依附于某种载体进行传输
D.
信息有时效性，没有时滞性
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