【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
【简答题】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()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()。
【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。
【简答题】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()上。