我
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- A.平面α与平面β垂直
- B.平面α与平面β所成的（锐）二面角为45°
- C.平面α与平面β平行
- D.平面α与平面β所成的（锐）二面角为60°
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- A.<img src="//img1.yqda.net/question-name/17/0cda92bcd2ba756754753e22bfdf56.gif" alt="" />
- B.<img src="//img1.yqda.net/question-name/d0/4067702369a258f7bdc57d68a51d37.gif" alt="" />
- C.<img src="//img1.yqda.net/question-name/70/cb4cfcebf8ebe48fe287361626a894.gif" alt="" />
- D.<img src="//img1.yqda.net/question-name/d4/7d7108f9cf51e20da459039fd8f256.gif" alt="" />
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- A.当k＝1时，f(x)在x＝1处取得极小值
- B.当k＝1时，f(x)在x＝1处取得极大值
- C.当k＝2时，f(x)在x＝1处取得极小值
- D.当k＝2时，f(x)在x＝1处取得极大值
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- A.a＝4
- B.a＝5
- C.a＝6
- D.a＝7
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- A.<img src="//img1.yqda.net/question-name/06/7ba149ba1de80c52bf29b8e20bdab0.gif" alt="" />
- B.<img src="//img1.yqda.net/question-name/f5/d4881db738f4344195c09bee38d087.gif" alt="" />
- C.<img src="//img1.yqda.net/question-name/0b/9318bf37b92e6eeece57022793e996.gif" alt="" />
- D.<img src="//img1.yqda.net/question-name/ed/b94e7711e7726060f668d2e889dee1.gif" alt="" />
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- A.∠ABC＝90°
- B.∠BAC＝90°
- C.AB＝AC
- D.AC＝BC
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- A.充分不必要条件
- B.必要不充分条件
- C.充分必要条件
- D.既不充分也不必要条件
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已知
为正实数，则（ ）
为正实数，则（ ）- A.<img src="//img1.yqda.net/question-name/84/2809c84bda8a16f5fa7bf5785a68e9.gif" alt="" />
- B.<img src="//img1.yqda.net/question-name/37/31c8235ab8f600823c24234e4b0f40.gif" alt="" />
- C.<img src="//img1.yqda.net/question-name/c8/f3f4d83b307b6fe799a411c2ae1120.gif" alt="" />
- D.<img src="//img1.yqda.net/question-name/f3/c26011c4361b519f0a4b6c0f48b4d7.gif" alt="" />
- A.－3＋i
- B.－1＋3i
- C.－3＋3i
- D.－1＋i
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- A.(－2，1]
- B.（－∞，－4]
- C.（－∞，1]
- D.[1，＋∞)
