等腰三角形中，一个顶角是80°，另外两个底角是______．

清末北洋水师的提督是( )。

A．李鸿章

B．丁汝昌

C．邓世昌

D．左宗棠

语法填空。

     阅读下面的短文，按照句子结构的语法性和上下文连贯的 要求，在空格处填入一个适当的词或

使用括号中词语的正确形式填空。

     Thomas and Inger, who live in Sweden, are the happiest couple in the world. Two years ago, they were

sailing on a boat a few kilometres 1_____ the beach. Thomas asked Inger to marry him and he gave her the 

2_____ (nice) gold ring he could afford to buy. While putting the ring on Inger's finger Thomas lost his

balance, slipped over and sent the ring flying into the sea. 3_____ (see) the ring drop into the water, they

were sure it was lost forever.

     That 4_____ (last) until week, when Mr. Carlsson came to visit them. Several days earlier Mr Carlsson,

who is the 5_____ (own) of a fish shop, was getting a fresh load of fish 6_____ (sell) at his shop. When he

was cutting open one of the fish he discovered it contained 7_____ beautiful gold ring. Inside the ring he read

the words 'To Inger, All my love, Thomas' and was curious to know 8_____ it came from. Mr. Carlsson

visited all the jewelers in town until he found the person 9_____ had made the ring. After leaming the address

of the rightful owner, Mr. Carlsson was able to return the ring.

     Meanwhile Thomas had bought Inger a replacement ring. Inger now loves both her wedding rings 10_____

thinks the one the fish ate is the better one.

（6分）根据下列实验回答问题。

A                               B                         C 

（1）仪器a的名称是    ，A中瓶底放少量水的作用是    。

（2）B中红磷不燃烧的原因是    ，白磷燃烧的化学方程式是    。

（3）C中观察到的现象是    ，反应的化学方程式是    。

急性化脓性骨髓炎持续剧烈疼痛是由子

A．细菌毒力强

B．病人对疼痛敏感

C．骨膜上神经末梢丰富

D．坚硬骨腔内压力骤升

E．肢体活动，充血反应

符号“V”表示焊缝名称是（）。

A.V形焊缝

B.单边V形焊缝

C.U形焊缝