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【单选题】
以下是关于二次型或矩阵的陈述: (1) 实二次型的矩阵的特征值为实数; (2) 复二次型的规范形由其秩唯一决定; (3) 复对称矩阵的特征值一定是实数. 其中正确的是A.
(1)(3)
B.
(1)(2)
C.
(2)(3)
D.
都不对
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反馈参考答案：
举一反三
【单选题】以下标识符中不全是保留字的是
A.
case for int
B.
default then while
C.
bool class long
D.
goto return char
【单选题】Task 3 Choose the best answers. 1) Farms are afraid that the cold weather will ________ crops.
A.
affect
B.
effect
C.
effective
D.
offend
【简答题】Task 3 Choose the best answers. We should make decisions according to________ conditions.A. difficult B. specific C. essential D. favorable
【单选题】Task 3 Choose the best answers. 1) We should make decisions according to ________ conditions.
A.
difficult
B.
specific
C.
essential
D.
favorable
【单选题】Task 3 Choose the best answers. We should make decisions according to ________ conditions.
A.
difficult
B.
specific
C.
essential
D.
favorable
【简答题】当出站兼调车信号机红灯灭灯时,复示器闪()灯
【单选题】Task 3 Choose the best answers. 1) Eating too much can result ________ obesity.
A.
in
B.
from
C.
to
D.
for
【单选题】以下标识符中不全是保留字的是
A.
case for int
B.
default then while
C.
bool class long
D.
oto return char
【单选题】Task3 Choose the correct Chinese meaning for each word. 1 bug
A.
挖掘
B.
打扰
C.
（程序等的）错误
D.
抛锚
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