农民种庄稼时,地里长了许多杂草.这时庄稼与杂草之间形成的关系是( ) A.竞争

题型:选择题

问题:

农民种庄稼时,地里长了许多杂草.这时庄稼与杂草之间形成的关系是(  )

A.竞争

B.共生

C.寄生

D.捕食

考点:生物与环境的相互作用
题型:选择题

在对关系模式进行规范化的过程中,对2NF关系进行投影,要得到3NF消除原关系中非主属性代码的

A.传递函数依赖

B.部分和传递函数依赖

C.连接依赖

D.多值依赖

题型:选择题

用橡胶处理的其他纺织物

题型:选择题

一般含烷烃多的原油,粘度()。

A.较小

B.较大

C.适中

D.很大

题型:选择题

所制备的药物溶液对热极为敏感()

A.采用棕色瓶密封包装

B.制备过程中充入氮气

C.产品冷藏保存

D.处方中加入EDTA钠盐

E.调节溶液的pH值

题型:选择题

A client with a history of panic attacks seeks to increase social interaction. Each time the client tries to go to the dayroom, she begins to perspire and becomes short of breath. Which action by the nurse will help ease the client's feelings of panic

A.Have other clients volunteer to accompany the client.

B.Tell the client she has to overcome her fear.

C.Allow the client to stay in her room.

D.Walk with the client and stay with her while she's in the dayroom.

更多题库