【判断题】【消耗次数：1】
非齐次线性方程组的两个解的和仍然是解.
①
正确
②
错误
参考答案：
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相关题目
【多选题】
设x1和x2是齐次线性方程组Ax=0的解，则
①
x1-x2是齐次线性方程组Ax=0的解。
②
x1+x2是齐次线性方程组Ax=0的解。
③
2x1-x2是齐次线性方程组Ax=0的解。
④
x1+2x2是齐次线性方程组Ax=0的解。
【多选题】
设x1和x2是非齐次线性方程组Ax=b的解，则
①
x1-x2是齐次线性方程组Ax=0的解。
②
x1+x2是非齐次线性方程组Ax=b的解。
③
x1-x2是非齐次线性方程组Ax=b的解，则
④
0.5x1+0.5x2是非齐次线性方程组Ax=b的解。
随机题目
【单选题】
Please send us a list of your ( ) and let us know if you are prepared to allow discount for a block booking.
①
price
②
quotatio
③
rate
④
tariffs
【单选题】
I’m afraid our hotel is fully ( ) on that day.
①
booked
②
booking
③
reserving
④
reservation
【单选题】
Housekeeping, may I come in? what is the meaning of the word “housekeeping”?
①
夜床服务
②
洗衣服务
③
送餐服务
④
客房服务
【单选题】
Do you have any ice? I am used to have a nightcap before I go to bed.What is the meaning of the word “nightcap”?
①
沐浴
②
夜读
③
夜宵
④
睡前饮料
【单选题】
I used my drivers license as ( )
①
identification
②
identity
③
identify
④
identifying
【单选题】
A convention guarantees a good occupancy ( )over a period.
①
discount
②
guarantee
③
quotation
④
rate
【单选题】
I am a bit ( ) at the moment. Can you come back later?
①
tied over
②
tied out
③
tied up
④
tied
【单选题】
This letter is to ( ) my fax and your answer of today in which you agreed to reserve two separate room with shower and bath, full pension
①
confirm
②
confirmation
③
Confirming
④
firm