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【单选题】

气井试井时,加重杆重量必须大于气体上升冲力,对于()的气井,应加大重量。

A.
产水量大
B.
产气量大
C.
产水量小
D.
产气量小
题目标签:重量冲力上升
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参考解析:
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【单选题】第二篇 Pushbike Peril Low speed bicycle crashes can badly injure—or even kill—children if they fall onto the ends of the handlebars (车把). So a team of engineers is redesigning the humble h...

A.
it is not easy to persuade manufacturers to adopt the new design.
B.
the team of engineers has not found any countermeasures.
C.
children like to ride bicycles at a very low speed.
D.
a lot of children were killed in bicycle accidents in the past 30 years.

【单选题】(2005年)要用冲床在厚度为t的钢板上冲出一圆孔,则冲力大小( )。

A.
与圆孔直径的平方成正比
B.
与圆孔直径的平方根成正比
C.
与圆孔直径成正比
D.
与圆孔直径的三次方成正比

【多选题】上升极限位置限制器有()等几种。

A.
重锤式
B.
螺杆式
C.
齿轮式
D.
凸轮式
E.
杠杆式

【单选题】要用冲床在厚度为t的钢板上冲出一圆孔,则冲力大小 ( )。

A.
与圆孔直径的平方成正比
B.
与圆孔直径的平方根成正比
C.
与圆孔直径成正比
D.
与圆孔直径的三次方成正比
相关题目:
【单选题】第二篇 Pushbike Peril Low speed bicycle crashes can badly injure—or even kill—children if they fall onto the ends of the handlebars (车把). So a team of engineers is redesigning the humble h...
A.
it is not easy to persuade manufacturers to adopt the new design.
B.
the team of engineers has not found any countermeasures.
C.
children like to ride bicycles at a very low speed.
D.
a lot of children were killed in bicycle accidents in the past 30 years.
【单选题】(2005年)要用冲床在厚度为t的钢板上冲出一圆孔,则冲力大小( )。
A.
与圆孔直径的平方成正比
B.
与圆孔直径的平方根成正比
C.
与圆孔直径成正比
D.
与圆孔直径的三次方成正比
【多选题】上升极限位置限制器有()等几种。
A.
重锤式
B.
螺杆式
C.
齿轮式
D.
凸轮式
E.
杠杆式
【单选题】要用冲床在厚度为t的钢板上冲出一圆孔,则冲力大小 ( )。
A.
与圆孔直径的平方成正比
B.
与圆孔直径的平方根成正比
C.
与圆孔直径成正比
D.
与圆孔直径的三次方成正比
【单选题】阳热有余,蒸腾胃中腐浊邪气上升可形成
A.
白腻苔
B.
积粉苔
C.
黄腻苔
D.
腐苔
E.
黏腻苔