我国常用导线标称截面积2.5mm2与6mm2的中间还有一级导线的截面积是（）mm2。

阅读短文，判断句子正误。正确的写“T”，错误的写“F”。

      I have a new neighbour (邻居). His name is John. He's older than me. He's from Canada. He's a university

student. He's tall. He's very funny. I like to play with him. We're good friends.

( ) 1. John is my new neighbour.

( ) 2. John is older than me.

( ) 3. John is short.

( ) 4. I like to play with John.

( ) 5. John is from America.

— It's said a pianist will perform at Poly Theater on Friday evening. Is it Lang Lang?

— Yes, it _______ him. He _______ for a week.

A．must be; has arrived here

B．maybe; has been here

C．must be; has been here

D．maybe; has arrived here

原子吸收分光光度法中，光源的作用是( )。

A．发射很强的连续光谱

B．发射待测元素基态原子所吸收的特征共振辐射

C．产生具有足够强度的散射光

D．提供试样蒸发和激发所需的能量

慢性支气管炎急性发作伴细菌感染时，最主要的临床表现是（）。

A.咳嗽加重

B.咳白色泡沫痰与黏液痰

C.咳脓性痰且痰量增加

D.肺部有哮鸣音

E.肺底部有干啰音

TJWX-2000型信号微机监测系统中（）是采集机的核心，对模拟量与开关量进行综合处理，并通过CAN总线与站机通信。

A、电源板

B、采集板

C、数据格式

D、CPU板