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【判断题】
矩阵的数乘(λA)运算,是将矩阵中的每一个元素都乘以λA.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】Mr.Shimano often takes a bike...
A.
from his company's R&D department.
B.
to his company's R&D department.
C.
for his company's R&D department.
D.
to work with his company's R&D department.
【单选题】Hospital doctors don't go out very often as their work _____ all their time. [ ]
A.
takes away
B.
takes up
C.
takes over
D.
takes in
【单选题】Jack often works at weekends to _________ more money for his family. [ ]
A.
make
B.
have
C.
bring
D.
take
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