按照线程的模型，一个具体的线程也是由虚拟的CPU、代码与数据组成，其中代码与数据构成

Which of the following is least accurate regarding obstacles to the efficient allocation of resources in a competitive market（）

A. Taxes and trade restrictions impede the efficient allocation of resources.

B. Quotas result in production of less than the efficient quantity of the good.

C. Public goods, such as national defense, tend to be overproduced because they can be consumed by everyone whether they pay for the goods or not.

肺炎喘嗽的主要临床表现有

A．发热

B．咳嗽

C．鼻煽

D．气急

E．胸闷

—The weather report says the heavy rain will last for another three days.

—Oh, that’s terrible. I’m afraid the bridges will be ______ away by the flood caused by the rain.

A．washed

B．taken

C．put

D．kept

下列关于营养性巨幼红细胞性贫血骨髓象特点中错误的是（）

A.幼红细胞呈巨幼变

B.巨核细胞分叶过多，胞质颗粒减少

C.粒细胞大，分叶过多

D.红细胞胞质成熟程度较胞核差

E.红系代偿性增生造血

患者低热、腹部触及肿块可见于()

A．溃疡性肠结核

B．溃疡性结肠炎

C．结核性腹膜炎

D．结肠癌

E．克罗恩病