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【单选题】
在Excel中,在单元格中输入分数3/5,应录入( )。A.
0.6
B.
0 3/5(0和3/5之间键入一个空格)
C.
3/5
D.
3
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【简答题】阅读理解。 'What's happened to the bottle of medicine?' He couldn't find it in this usual place on a table in the sitting room.' What have you done with it?' he asked his wife. She said she hadn't seen it,...
【简答题】用所给词的适当形式填空。 1. When she couldn't find her mother, she ______ (begin) to cry. 2. —When did the movie ______(begin)? —It _____ (begin) about ten minutes ago. 3. At the ______ (begin) of this term...
【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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