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【多选题】
下列关于数码管静态显示和动态显示说法正确的是( )。A.
静态显示的每个数码管段码线均不同，程序控制简单
B.
静态显示占用的 I/O 线较多，适用于数码管较少的场合
C.
动态显示共用同一组段码线，占用 I/O 线较少
D.
动态显示程序控制较复杂，但可以控制所有数码管同时点亮
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举一反三
【单选题】Which statement is true?
A.
Internet can’ t open markets that were previously closed
B.
Whether e-commerce promote international trade will depend on the nature of good
C.
The significance of geographic proximity and traditional business networks can’ t be reduced
D.
Trade can’ t effect internet use
【单选题】Which statement is false ?
A.
The fish was hooked in the noon, but the old man hasn ’ t seen it until the night.
B.
The old man had spent the whole night on the sea without knowing what kind of fish being hooked it was.
C.
The old man has no sense of loneness since he believed that a man can never be alone on the sea.
D.
Something was wrong with the old man ’ s hands.
【单选题】which of the statement about t distribution is wrong?
A.
the t distribution is a family of curves
B.
the distribution is unimodal distribution
C.
center on 0, left and right symmetry
D.
the t distribution only have a curve
E.
when ν= ，t distribution approximates z/u distribution
【判断题】分型面选择时为便于侧分型和抽芯,若塑件有侧孔或侧凹时,宜将侧型芯设置在垂直开模方向上,除液压抽芯机构外,一般应将抽芯或分型距较大的放在开模方向上。
A.
正确
B.
错误
【单选题】Which statement about diesel engine combustion is true?
A.
Combustion does not begin until the piston starts down on the power stroke
B.
Maximum combustion pressure is reached before TDC
C.
Turbulence in the cylinder causes a delay in ignition
D.
Maximum cylinder firing pressure is not developed until the piston passes TDC
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