电机扩大机外特性是指（）。A、端电压与输出电流的对应关系 B、端电压与转速的对应变化

根据短文判断下面各句正（T）误（F）。

     There is a farm near my home. The farmers there grow rice and wheat. They have many animals on the

farm. But they don't use them to do farm work. They use a tractor. We often go to the farm after school. We

can play with the animals, walk, read books or help the farmers pick corn there. I like walking or doing some

reading on the farm because the air there is nice and clean. 　　

     You can see a lake on the farm. There are many fish in the lake. We often go fishing on Saturdays and

Sundays. We often swim in the lake in summer and skate on it in winter, too. 　　　　

(　 ) 1. On the farm near my home, farmers use animals to do farm work. 　　

(　 ) 2. I like reading books on the farm because there is a lake on it. 　　

(　 ) 3. The air on the farm is very clean. 　　

(　 ) 4. On Saturdays and Sundays, we often swim in the lake.

休克病人可以采取的体位是

A．半卧位

B．截石位

C．俯卧位

D．平卧位

E．中凹位

The bank is ______  the supermarket. It's easy ______  there. [ ]

A. in front; get to     

B. in the front of; get to

C. in front of; to get  

D. in the front of; to get

某些精神失常患者可以通过心理疗法而痊愈，例如，癔病和心因性反应等。然而，某些精神失常是因为大脑神经递质化学物质不平衡，例如精神分裂症和重症抑郁，这类患者只能通过药物进行治疗。
上述论述是基于以下哪项假设？（）

A．心理疗法对大脑神经递质化学物质的不平衡所导致的精神失常无效。

B．对精神失常患者，药物治疗往往比心理疗法见效快。

C．大多数精神失常都不是由脑神经递质化学物质的不平衡导致的。

D．对精神失常患者，心理疗法比药物治疗疗效差些。

E．心理疗法仅仅是减轻精神失常患者的病情，根治还是需要药物治疗。

下列关于粉尘爆炸的特点，叙述有误的一项是( )。

A．爆炸感应期较长

B．有产生二次爆炸的可能性

C．燃烧时间短，产生的能量小

D．破坏程度大