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【简答题】
He came from a ___________ and undeveloped area. 2. This victory will help ___________ your confidence. 3. His father works for the Industrial and ___________ Bank. 4. Children often feel ___________ near their parents. 5. This medicine is for ___________ use only. 6. They agreed on how to ___________ the residents from the island. 7. The idea of a holiday abroad is certainly ___________. 8. He was known as a ___________ and honest man. 9. The drivers will be in danger when two cars ________. 10. I received an email with an ___________ picture yesterday.
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【简答题】听下面一段材料，回答第1至2题。 1. Why is the woman late? A. She missed the bus B. She couldn't start her car C. She couldn't find the key 2. Where are the two speakers? A. At a garage B. At a bus stop C. At a resta...
【多选题】弹簧振子的振幅增加一倍，则
A.
振动周期增加一倍
B.
最大加速度增加一倍
C.
总能量增加二倍
D.
最大加速度不变
E.
最大速度增加一倍
F.
振动频率增加一倍
G.
相位增加一倍
【简答题】二阶系统的闭环传函Φ(s)=25/(s2+s+25),则其单位阶跃响应的超调量δ%= _____ ,调节时间ts= _____ sec(对应5%误差带)。
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