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【简答题】
如果A是n级正定矩阵，B是n级半正定矩阵，则A+B是正定矩阵．
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举一反三
【简答题】A．He is pleased with his exciting new job. B．He finds the huge workload unbearable. C．He finds his office much too big for him. D．He is not to excited about his new position.
【简答题】He finds his new job a real _____________.(strained)
【单选题】《寂静的春天》一书向人们描述了大量施用杀虫剂对鸟类和人类生态环境造成的毁灭性破坏，敲响了工业社会环境危机的警钟。它的作者是)
A.
理查德·乔治
B.
科菲·安南
C.
蕾切尔·卡尔逊
D.
丹尼尔·梅多斯
【单选题】
A.
He is considering seeking a new job.
B.
He sometimes feels bored with his work.
C.
He is doing well though he does not like his work.
D.
He finds himself getting more interested in his work.
【简答题】选词填空。 从方框里选择正确的单词，并用其正确的形式填空。 automatic, fit, stress, chemistry, survival, disappointed compre hend , shame , strong , pill 1. You need to be tough to ____ in the jungle. 2. The problem is beyond my _...
【单选题】寂静的春天》一书向人们描述了大量施用杀虫剂对鸟类和人类生态环境造成的毁灭性破坏，敲响了工业社会环境危机的警钟。它的作者是
A.
蕾切尔·卡尔逊
B.
丹尼尔·梅多斯
C.
理查德·乔治
D.
科菲 · 安南
【单选题】What do we learn about the man from the conversation?
A.
He is pleased with his exciting new job.
B.
He finds the huge workload unbearable.
C.
He finds his office much too big for him.
D.
He is not so excited about his new position.
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