【单选题】【消耗次数：1】
下列不属于物流系统特征的是（ ）。
①
稳定性高
②
大时空跨度系统
③
客观存在性
④
复杂性
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相关题目
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关于线性系统稳定性的判定，下列观点正确的是（）。
①
线性系统稳定的充分必要条件是：系统闭环特征方程的各项系数都为正数；
②
无论是开环极点或是闭环极点处于右半S平面，系统不稳定；
③
如果系统闭环系统特征方程某项系数为负数，系统不稳定；
④
当系统的相角裕度大于零，幅值裕度大于1时，系统不稳定。
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移动性特征会使旅游文化系统产生相对的有稳定性、变易性，使旅游文化系统发生相应变化，其原因是：
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时代变化
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不同文化圈的变化
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不同社会制度的变化
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旅游线路的变化
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下列有关生态系统稳定性的叙述，不正确的是（）
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A.生态系统具有自我调节能力，这是生态系统稳定性的基础
②
B.生态系统内部结构与功能的协调，可以提高生态系统稳定性
③
C.生物多样性对维持生态系统稳定性具有重要作用，体现了其间接价值
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随机题目
【单选题】
4. I think the story is not so ____as that one.
①
interesting
②
interested
③
more interesting
④
most interesting
【单选题】
3.This book is ____that one, but ____than that one.
①
as difficult as; expensive
②
as more difficult as; more expensive
③
as difficult as; more expensive
④
more difficult as; as expensive
【单选题】
20. Your room is ____ than mine.
①
three time big
②
three times big
③
three times bigger
④
bigger three times
【单选题】
18. The earth is about ____ as the moon.
①
as fifty time big
②
fifty times as big
③
as big fifty times
④
fifty as times big
【单选题】
15.–What’s your brother like? –He is____.
①
a driver
②
very tall
③
my friend
④
at school
【单选题】
6. I think science is ____than Japanese.
①
much important
②
important
③
much more important
④
more much important
【单选题】
5. His father began to work ____he was seven years old.
①
as old as
②
as early as
③
as soon as
④
as much as
【单选题】
13. The house is ____ small for a family of six.
①
much too
②
too much
③
very tall many
④
many very tall
【单选题】
10. It was very hot yesterday, but it is ____today.
①
even hotter
②
more hotter
③
much more hot
④
much hot