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【简答题】
(1)设三维向量组 则 ___ __, __ ___, =_______, =___ __, =____ . (2)设 阶可逆阵 的特征值是 则 的特征值为___. (3)设 为 阶方阵,且 有非零解,则 必有一个特 征值为____. (4)设 阶方阵 的特征值分别为 则 =______. (5)设向量 与 正交,则 。 (6)设三阶矩阵 特征值为 , 若 ,则 = 。
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举一反三
【单选题】A brand ________ is the set of all brands and brand lines a particular firm offers for sale to buyers in a particular category.
A.
architecture
B.
position
C.
portfolio
D.
extension
【单选题】下列选项中，不属于办公室作业的是（ ）。 A. 书写 B. 资料管理 C. 电话通讯 D. 计算机辅助训练 E. 治疗性游戏
A.
a
B.
b
C.
c
D.
d
E.
e
【单选题】If a firm happened to be the only seller of a particular product, it might behave as a price taker as long as
A.
there are many buyers.
B.
the transaction costs of doing business with this firm are low.
C.
there is free entry and exit.
D.
buyers have full information about the firm's price.
【简答题】用所给词的适当形式填空。 1. We are going to have great fun _____ (sing) this song. 2. Would you like something _____ (eat)? 3. There _____ (be) a desk and three chairs. 4. Listen! Who _____ (cry)? 5. _____ (not c...
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