镦粗

It's nice of you to _____ so much time showing me around your school. [ ]

A. take

B. spend

C. cost

D. have

--- Seems that Jack is very rich. He is always changing his cars. What is he?

--- ______, but I am not quite sure.

A．Somebody of a manager

B．Something of a manager

C．Anyone of a manager

D．Anything of a manager

“根管口”的正确位置是

A．根管末端开口处

B．髓腔开口处

C．髓腔中根分叉部位

D．髓室和根管交界的部分

E．根管最细的地方

法院判决李某败诉是否符合法律规定为什么

下列选项中，关于大气环境现状监测不同布点方式的监测目的说法正确的是( )。

A．功能布点：模式验证，测定扩散参数，测定下风向下的浓度分布
B．同心圆布点：为弄清某地区各风向方位的污染状况
C．网络布点：为弄清某些特定区域污染影响
D．扇形布点：为弄清多而分散的污染源所引起的大气污染