透水率是垂直于土工织物平面流动的水,在水位差等于（ ）时的渗透流速。

With the large number of dogs roaring through our commu...

单项选择题With the large number of dogs roaring through our communities, people need to know the facts about rabies（狂犬病）, a fatal disease caused by animal bites. Despite vaccination（接种疫苗）programs, rabies is still very prevalent, and will continue to be a serious public health problem for many years to come.
Rabies strikes the central nervous system and brings on choking, convulsions（抽搐）and inability to swallow liquids. It can even cause death. If you or anyone in your family is bitten by dog, cat or other animal, you should not panic, but thoroughly wash the wound with plenty of soap and water and rush to nearby hospital for immediate treatment. If you own the animal which did the biting, you should immediately call a veterinarian for advice and make sure the public health authorities know when and where the biting took place and who was bitten.
If a person is bitten by some kind of animal, you ____.（　　）

锅炉房通向室外的门的开启方向，以及锅炉房内的工作间直通锅炉间的门的开启方向应分别为（　　）。A.内开，向工作间...

单项选择题锅炉房通向室外的门的开启方向，以及锅炉房内的工作间直通锅炉间的门的开启方向应分别为（　　）。

极限( 　 )A．; B．; C．; D．以上选项都不正确。

单项选择题极限( 　 )

A．;
B．;
C．;
D．以上选项都不正确。