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【单选题】
科学上的重大发现往往是由年轻人做出的，下面列出了自16世纪初期至20世纪早期的十二项重大发现及其发现者、发现年份和发现者当时的年龄。【图片】设样本来自正态分布总体，求发现者当时的平均年龄的置信水平为90%的置信区间：A.
[31.4977,39.0023]
B.
[30.4977,38.0023]
C.
[32.4977,37.0023]
D.
[32.4977,38.0023]
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举一反三
【单选题】The angle at which 90 ° refraction of a longitudinal sound wave is reached is called
A.
The angle of incidence
B.
First critical angle
C.
The angle of maximum reflection
D.
The second critical angle
【单选题】The angle at which the anchor flukes penetrate the soil is the（）.
A.
burial angle
B.
penetration angle
C.
fluke angle
D.
holding angle
【单选题】A curve is a line_________no part is straight and which has no angle.
A.
that
B.
whose
C.
of which
D.
which
【简答题】Which one of each of the following pairs is expected to have the larger bond angle?
【单选题】the is the angle at which the airfoil begins to loses its lift.
A.
angle of attack
B.
blade angle
C.
pitch angle
D.
critical angle of attack
【单选题】The maximum angle at which the intact stability curves are valid for ship’s is the angle for（）.
A.
the limit of positive stability
B.
the limit of small-angle stability
C.
maximum offset
D.
downflooding
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