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【单选题】
已知函数 在 上是增函数,且 ,则的取值范围是A.
(1,+ )
B.
(- ,1)
C.
( ,+ )
D.
(- , )
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举一反三
【简答题】在曲柄摇杆机构中，若以摇杆为主动件，最小传动角发生的位置在曲柄与 共线位置。
【单选题】Which of the following is NOT TRUE?
A.
We have atoms all around us.
B.
All atoms are moving.
C.
There are millions of atoms in only one grain of salt.
D.
When heated, an object will hold together and give its shape.
【多选题】第二节 七选五(共 5 题,每题 2 分,共 10 分) 1. 根据短文内容 , 从短文后的选项中选出能填入空白处的最佳选项 , 选项中有两项为多余选项。 Self-care activities can help you cope with stress and improve overall well-being. 1 ______. Normally, a good deal of prac...
A.
Eat healthy foods
B.
Have your meal regularly
C.
Practicing self-care is especially important
D.
Schedule time-off from your responsibilities
E.
Schedule regular appointments with your doctor
F.
However, people are practicing self-care everyday
G.
Choose activities that are fun and interesting for you
【简答题】在曲柄摇杆机构中,极位夹角是指_____两次共线时所夹的锐角;而最小传动角通常发生在 _____两次共线的位置之一。
【简答题】在曲柄摇杆机构中，若以摇杆为主动件，最小传动角发生的位置在 位置。
【多选题】离心泵抽空、无流量，其发生的原因可能有（ ）
A.
启动时泵内未灌满液体
B.
吸入管路堵塞或仪表漏气
C.
吸入容器内液面过低
D.
泵轴反向转动
E.
泵内漏进气体
F.
底阀漏液
【单选题】A He doesn't want to be his own boss. B. He hates getting outside. C. He dislikes moving around. D. He doesn't like to stay in the office.
A.
A He doesn't want to be his own boss.
B.
He hates getting outside.
C.
He dislikes moving around.
D.
He doesn't like to stay in the office.
【简答题】在曲柄摇杆机构中,极位夹角是指_____两次共线时所夹的锐角;而最小传动角通常发生在_____两次共线的位置之一。
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