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【单选题】
若流体在某粗糙管内高度湍流,当流量加倍,对同一直管段来说,阻力将增至原来的 倍A.
2
B.
4
C.
1
D.
8
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反馈参考答案：
举一反三
【单选题】Why does the woman tell the man about her experience?
A.
To demonstrate the benefits of going to the Office of Career Development
B.
To encourage the man to talk with an advisor about an internship
C.
To suggest that he change his major from math to library science
D.
To give the man her opinion about his career decision
【多选题】施工单位主要负责人依法对本单位的安全生产工作全面负责，应该( )。
A.
应当建立健全安全生产责任制度
B.
应当制定安全生产规章制度和操作规程
C.
保证本单位安全生产条件所需资金的投入
D.
对所承担的建设工程进行定期和专项安全检查
【单选题】What does the woman tell the man about?
A.
His scores in recent tests.
B.
The difficulties he has with his studies.
C.
His poor academic performance.
【简答题】施工单位的主要负责人依法对本单位的安全生产工作全面负责。()
【单选题】What does the woman remind the man about?
A.
That taste buds aren’t located only on the tongue.
B.
That taste buds aren't all the same size.
C.
That solutions must be measured and mixed careful.
D.
That he shouldn’t swallow the solutions.
【单选题】打开点火开关，仪表正常点亮，解码仪扫描全车，整车控制器不能通讯的原因可能是（ ）。
A.
点火开关损坏
B.
诊断接口损坏
C.
主接触器不工作
D.
整车控制器供电保险断路
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