搜题请搜索小程序“爱下问搜题”
问题 多项选择题

胸主动脉瘤临床可见（）

A.咯血

B.声音嘶哑、气管移位、阻塞

C.X线片示：主动脉相应部位增大

D.上腔静脉或肺动脉受压

E.胸痛、气急、吞咽困难

答案

参考答案：A, B, C, D, E

填空题

请用will, shall或be going to填空。

1. What _________________ you buy?

2. He _________________ go there by train tomorrow afternoon.

3. _________________ you _________________ play the piano this evening?

4. Mary _________________ be at home tomorrow morning.

5. Where _________________ you go the day after tomorrow?

6. _________________ I watch TV for a short time, please, Mum?

7. _________________ you take the bag to my brother, please?

8. _________________ we go to the park?  OK Let's go!

9. My father _________________ drive home from Beijing next Sunday.
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单项选择题

将线性规划问题转化为标准形式时，下列说法不正确的是（）

A.如为求z的最小值，需转化为求-z的最大值

B.如约束条件为≤，则要增加一个松驰变量

C.如约束条件为≥，则要减去一个剩余变量

D.如约束条件为＝，则要增加一个人工变量
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