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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.
【简答题】Which statement below correctlydefines topic sentences?A. A t opicsentence is a sentence on the top of a paragraph.B. A topic sentence states the point tobe detailed in the paragraph.C. A topic senten...
【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
【单选题】Which statement about the Lubrication oil is fault?
A.
The oil washes off dirt away from the engine parts through its chemistry.
B.
The oil forms a good seal between piston rings and cylinder walls.
C.
The oil absorbs and carries the heat away from the engine components.
D.
The oil forms a film on the metal surface and prevents a metal to metal contac t.
【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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