在气体的流动过程中流体流动类型为湍流时Re（）。

A:Re＜2320 B:＞10000 C:2320＜Re＜10000 D:Re与液体流动无关

当（）时，可用公式λ=64/Re来计算沿程阻力系数。

A:紊流 B:Re〈2000 C:Re〉2000

雷诺数Re可用来判别流体的流动状态，当（）时是层流状态。

A:Re小于2300 B:Re大于2300 C:Re大于1000 D:Re小于1000

雷诺系数Re可用来判别流体的流动状态，当（）是层流状态。

A:Re＜2000 B:Re＞2000 C:Re＞1000 D:Re＜1000

流体在直管内流动时，当雷诺数Re（）时，流体的流动属于湍流。

A:Re≥4000 B:Re≤2000 C:Re≥3000 D:2000≤Re≤4000

有压圆管恒定流，若断面1的直径是其下游断面2的直径的二倍，则断面1的雷诺数Re1与断面2的雷诺数Re2的关系是：（）

A:Re1=Re2 B:Re1=0.5Re2 C:Re1=1.5Re2 D:Re1=2Re2

An organization structure that involves various organizational types at various levels is called a （）.

A:strong matrix B:balanced organization C:composite D:balanced matrix

Organization

In a ______, team members are often collocated. Most of the organization’s resources are involved in project work, and project managers have a great deal of independence and authority.

A:functional organization B:weak matrix organization C:balanced matrix organization D:projectized organization

In a （）, team members are often colocated. Most of the organization’s resources are involved in project work, and project managers have a great deal of independence and authority.

A:functional organization B:weak matrix organization C:balanced matrix organization D:projectized organization