根据临床表现分类流产有哪些（）。 A.稽留流产 B.先兆流产 C.不全流产 D.习惯

阅读文章，根据文章内容完成表格。

     A taboo is a social action that is not allowed. Every culture in the world has its own taboos. The breaking

of a taboo sometimes makes people feel uncomfortable. I learned this through my own experience.

     Last weekend, Wang Lin and I showed two foreigners around our city. Mr. Singh was from India and

Mr. White from the USA. When I held out my left hand to shake hands with him, Mr. Singh seemed to be

unhappy. Mr. White, however, was quite casual (随意的). He said hello to me with a big smile and a wave

of his hand.

     In the evening, we stopped at a restaurant for dinner. I noticed that Mr. Singh didn't touch the beef and

Mr. White seemed not to like chickens' claws(爪子). During the meal, Wang Lin said sorry to Mr. Singh and

continued to explain that we didn't know it was a taboo in India to shake one's left hand. Mr. Singh explained

that since oxen (牛) are sacred (神圣的) in India, people don't eat beef there. Mr. White joined in and said that

it was not usual in the States for people to eat chickens' claws. He went on to say that Americans don't usually

get into each other's personal space. Isn't it a good lesson to remember?

当主、次干路车流量在高峰时段特别集中，间隙特别小时，应考虑安装（）自动控制信号。

A.调节式

B.集中式

C.感应式

D.整体式

维生素B₂缺乏的典型症状为______。

A．神经管畸形

B．皮肤和牙龈出血

C．皮肤干燥

D．唇炎和口角炎

E．腹泻

出入戒严地区的人员、车辆必须持有( )和戒严实施机关签发的特别通行证，按指定的时间、路线出入，不得自由行动。

A．本人身份证件

B．本人暂住证

C．本人户口本

D．本人务工证

板型的计算机控制功能主要有设定功能，前馈功能，反馈功能，（）。