单项选择题

The angle at which the anchor flukes penetrate the soil is the（）.

A.burial angle
B.penetration angle
C.fluke angle
D.holding angle

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The anchors on the bow are known as（）.

A.bower anchors
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C.spare anchors
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A.relayed
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Tensile stress is a result of two forces acting in（）.

A.opposite directions on the same line，tending to pull the material apart
B.opposite directions on the same line，tending to compress the object
C.opposite directions along parallel lines
D.the same direction along parallel lines