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According to the picture, a cylinder was placed at an angle on a horizontal plane. A is the center of the bottom circle, and AD is the radius of the circle. BC=10. AC is horizontal to the horizontal plane and perpendicular to BD. DC=?

(1)∠ADE=60°

(2)AC=2AD
  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2) TOGETHER are NOT sufficient.
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正确答案: D

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