左侧门使能继电器得电后，（）灯会亮。A、左侧间壁上的开门按钮 B、司机台体上的开门按

证券公司从事中间介绍业务，应当取得( )资格。

A．介绍业务
B．投资咨询
C．结算业务
D．代理交易

单词拼写

1．I had no idea how to deal with ________(孤独)when I just began to study abroad.

2．I don't know what I would do ________ (不同地) if I were directing the movie.

3．________ (记录)fell like ripe apples on a windy day.

4．You see, my Tshirt has ________(缩水) after repeated washings.

5．We need a foreign policy which is more ________ (灵活的)．

6．Education is ________ (义务) for children in most countries.

7．Education is not the filling of a pail, but the ________ (点燃) of a fire.

8．He's a terrible dancer; he's too clumsy and keeps ________ (踩) on my feet.

9．The office has been ________ (堆) with work ever since the new boss arrived.

10．A good teacher encourages you to ask questions, even if your ideas aren't________(完全地)

correct.

属于顺式作用元件的是

A．转录抑制因子

B．转录激活因子

C．O因子

D．p因子

E．增强子

MPEG-1视频编码标准中定义了（）种不同类型的视频帧，其中（）在各种帧类型中数据量居中，而数据量最小的（）在之前的H.261标准中并没有定义，能够直接作为索引和访问点的是（）。

而数据量最小的（）在之前的H.261标准中并没有定义。

A．I帧

B．S帧

C．B帧

D．P帧

简述电能表检定中的虚负荷检定法、实负荷检定法及它们的应用场合。