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【简答题】
听对话、短文和问题,选择正确答案。 1. What are they talking about? A. How to make apple juice. B. How to make a blender. C. How to make milk shake. 2. How do they make it? A. First cut up the apples, then put them in the blender and next drink it. B. First turn on the blender, then pour them in the blender and next peel the apples. C. First peel and cut up the apples, then put them and some milk in the blender and next turn on the blender. 3. What was the matter with Robert? A. He had a sore back. B. He had a headache. C. He had a stomachache. 4. What did Robert's mother often tell him? A. To study hard. B. To drink more hot tea. C. To wear more warm clothes. 5. How was Robert feeling at last? A. A little better. B. Very bad. C. Sick.
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【单选题】二阶系统的传递函数为 ,则其无阻尼固有频率ω n 和阻尼比ξ依次为()。
A.
1,0.5
B.
0.5,1
C.
2,1
D.
1,2
【单选题】二阶系统的传递函数为 G(s)= , 其无阻尼固有频率ω n 是
A.
10
B.
5
C.
2.5
D.
25
【单选题】二阶系统的传递函数为 ,其无阻尼固有频率为 ( )。
A.
4
B.
2
C.
0.5
D.
0.2
【单选题】某 二阶系统的传递函数为 ,则其无阻尼固有频率 为 ( ) 。
A.
0.25
B.
0.5
C.
1
D.
4
【简答题】小刚有15个苹果,分了 给小敏,小敏分得几个苹果?
【单选题】工化 2.2.2 下列离子晶体中熔点最高的是 ( )。
A.
CaF 2
B.
CaO
C.
CaCl 2
D.
BaO
【单选题】---- Did you catch the first bus this morning? ---- If I ___________ earlier, I ___________ the bus.
A.
got up; would catch
B.
should get up; could catch
C.
had got up; would have caught
D.
had got up; would catch
【单选题】十字花科植物的雄蕊都是 ( )。
A.
四强雄蕊
B.
二强雄蕊
C.
单体雄蕊
D.
聚药雄蕊
【单选题】下面说法错误的是( )。
A.
冬瓜、西瓜、南瓜、苦瓜都是葫芦科植物
B.
芥菜、荠菜、甘蓝、紫罗兰都是十字花科植物
C.
陆地棉、锦葵、向日葵、朱槿都是锦葵科植物
D.
栝楼和蒲公英虽不同科,但都有聚药雄蕊
【单选题】有二阶系统的传递函数为 ,则其无阻尼固有频率和 阻尼比 依次为 ( ) 。
A.
2,1
B.
2,2
C.
1,0.5
D.
0.5,1
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