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【多选题】
在一输送系统中,改变离心泵出口阀门开度，将影响：A.
管路特性曲线
B.
管路所需压头
C.
泵的特性曲线
D.
泵的工作点
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举一反三
【判断题】在讨论企业信息资源之前 , 我们应该首先明确企业信息流中哪些信息是有显著经济价值 , 这样才能确保信息资源开发具有战略意义及信息流运动过程中的关键环节的开发 , 并非所有信息资源都具有开发空间和价值 .
A.
正确
B.
错误
【简答题】听下面一段材料，回答第1至3题。 1. What's wrong with Mr. Smith? A. He's got a cold. B. He's got a headache. C. He's got a fever. 2. Has he taken his temperature? A. Yes, he has. B. No, he hasn't. C. We don't know. 3...
【简答题】听句子，选择正确的答语，将序号写在括号内： ( ) 1. A. He's got a white cat. B. He's got a bad headache. C. He's got a Chinese-English dictionary. ( ) 2. A. Sorry, I don't know. B. Great! That's a good idea. C. Sure...
【单选题】初孕妇,末次月经日期不清,自觉1月前出现胎动,检查:宫高平脐,胎动148次/分。此时妊娠大约为
A.
14--16周
B.
.16--18周
C.
18--20周
D.
22--24周
E.
.24--26周
【简答题】听对话，回答问题。 1. What's wrong with the boy? A. He's got a cough. B. He's got a fever. C. His back hurts. 2. Who is going to the hospital? A. The boy. B. His mother. C. Both of them.
【简答题】听第一段对话，回答第1小题。 1. What's wrong with Tom? A. He's got a bad cold. B. He's got a fever. C. He's got a toothache.
【单选题】初孕妇,末次月经日期不清,自觉1月前出现胎动,检查:宫高平脐,胎心148次/分。此时妊娠天约为
A.
14~16周
B.
16~18周
C.
18~20周
D.
22~24周
E.
24~26周
【简答题】听下面一段材料，回答第1至3题。 1. What is the man's problem? [ ] A. He's got a sore throat. B. He's got a fever. C. He's got a headache. 2. What might cause the man's problem? [ ] A. Mental pressure. B. Bad...
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