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【单选题】
设 是 矩阵, 是非线性方程组 对应的线性方程组,则下列结论正确的是( )A.
若 有无穷多解,则 有非零解;
B.
若 有无穷多解,则 只有零解;
C.
若 只有零解,则 有唯一解;
D.
若 有非零解,则 有无穷多解.
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举一反三
【单选题】女,46岁,反复出现腹痛、寒战高热、黄疸,此种现象多见于下列哪种疾病(0.8)
A.
胆囊结石
B.
急性胆囊炎
C.
胆总管结石，急性胆管炎
D.
胆道蛔虫症
E.
急性胰腺炎
【单选题】Listen to the conversation and choose the best answer to the following question. Why does the man's suit seem unusualaccording to the conversation? ( )
A.
Because the jacket does not suit him.
B.
Because he got dressed in the office.
C.
Because the jacket is too dark.
D.
Because the jacket and pants do not fit together.
【单选题】Listen to the conversation and finish the following 4 questions. Why does the customer not buy the recommended sandwich at the beginning of the conversation? ( )
A.
It is too expensive.
B.
He is not interested in ordering a burger.
C.
He fears the food will make him sick.
D.
He prefers Chinese dishes.
【单选题】What do we know from the conversation?
A.
The man is too tired to go to the cinema.
B.
The woman doesn' t want to go to the cinema.
C.
The woman wants to go to the cinema.
【单选题】What do we know from the conversation?
A.
The woman is too tired to go to the cinema.
B.
The woman doesn't want to go to the cinema.
C.
The woman wants to go to the cinema.
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