在如图所示的电路中，电阻R1=12Ω，R2=8Ω，R3=4Ω。当电键K断开时，电

I hear a number of workers in the factory_____out of work.

__Yes, and the number _____quite huge.

A．are; is

B．is; are

C．is; is

D．are; are

以下不属于不必要功能的是( )。

A．辅助功能

B．过剩功能

C．多余功能

D．重复功能

关于剂型的分类，下列叙述错误的是()。

A．溶胶剂为液体剂型

B．软膏剂为半固体剂型

C．栓剂为半固体剂型

D．气雾剂为气体分散型

E．吸入粉剂为经呼吸道给药剂型

对施工单位的工程文件的形成、积累、立卷归档工作进行监督、检查是( )的职责。

A．设计单位和监理单位

B．建设单位和监理单位

C．建设单位和地方城建档案管理部门

D．监理单位和地方城建档案管理部门

An architectural style defines as a family of such systems in terms of a （1）of structural organization. More specifically, an architectural style defines a vocabulary of（2） and connector types, and a set of （3） on how they can be combined. For many styles there may also exist one or more （4） that specify how to determine a system’s overall properties from the properties of its parts. Many of architectural styles have been developed over the years.

The best-known examples of （5） architectures are programs written in the Unix shell.

（4）是（）

A. semantic models

B. weak entities

C. data schemas

D. business models