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【单选题】
描述某系统的微分方程为y ꞌꞌ (t) +4y ꞌ (t) +4y(t)= f ꞌ (t) 则其齐次解的形式为A.
(C 1 t 2 +C 2 t+C 3 )e -2t
B.
(C 1 t +C 2 )e -2t
C.
(C 1 t +C 2 )e 2t
D.
(C 1 t 2 +C 2 t+C 3 )e 2t
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举一反三
【单选题】Which of the following statements describes why a properly designed and executed audit may not detect a material misstatement in the financial statements resulting from fraud?
A.
Audit procedures that are effective for detecting unintentional misstatements may be ineffective for an intentional misstatement that is concealed through collusion.
B.
An audit is designed to provide reasonable assurance of detecting material errors, but there is no similar responsibility concerning fraud.
C.
The factors considered in assessing control risk indicated an increased risk of intentional misstatements, but only a low risk of unintentional misstatements.
D.
The auditor did not consider factors influencing audit risk for account balances that have effects pervasive to the financial statements taken as a whole.
【单选题】Why do doctors risk their lives to intubate(插管) the seriously ill in a very fast manner?
A.
Because there are so many patients waiting to be treated.
B.
Because patients conditions could quickly deteriorate(恶化).
C.
Because they have so many works to do and are supposed to do everything as fast as possible.
【单选题】---Passage 1--- ---Question 46. Why does the author say that one needn't be concerned about memory slips? //////////////////////////////////////////////////////////////////// (Para.1) Losing your abil...
A.
Not all of them are symptoms of dementia.
B.
They occur only among certain groups of people.
C.
Not all of them are related to one's age.
D.
They are quite common among fifty-year-olds.
【单选题】下列关于商圈调研报告说法不正确的是( )。
A.
商圈调研报告是商圈调研及研究成果的集中体现，是调研活动的终端产品
B.
能给连锁企业门店的门店运营活动提供有效的导向作用
C.
商圈调研报告是正式的结论，只能以书面的形式呈现
D.
能为企业运营的决策提供客观依据
【单选题】Why does Musk say that people travelling to Mars are at fatal risk?
A.
Because human beings can not live on Mars.
B.
Because there is no civilization on Mars.
C.
Because Space X has lots of setbacks currently.
D.
Because the long journey to Mars will cost their lives.
【多选题】在一个由硬盘录像机构建的小型视频监控系统中,若出现有图像,但云台无法控制时,下列表述中,不可能出现的是( )。
A.
485 控制线破损或 485 转换器坏引起
B.
由 BNC 连接线虚焊引起
C.
解码器地址与软件中的地址不匹配引起
D.
摄像机故障引起
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