土层（soil horizon）
土层（soil horizon）
相关考题：
According to the text．which of the following is NOT true?A．Soil forms from weathered rock on the earth surface．B．The deeper layer of soil is darker in colour than t}le surface soil．C．Air pollution is partially responsible for acid soil．D．Groundwater tends to carry away nutrients for plant growth．
According to the text. which of the following is NOT true?A. Soil forms from weathered rock on the earth surface.B. The deeper layer of soil is darker in colour than the surface soil.C. Air pollution is partially responsible for acid soil.D. Groundwater tends to carry away nutrients for plant growth.
关于摩托基站CTU2单板的叙述，错误的是（）。A、CTU2安装于horizon micro机柜时，机柜必须配臵3个PSUs，并且不再有PSU作为冗余B、如果horizon micro机柜的某个PSU损坏将导致安装于horizon micro机柜的CTU2退服C、在horizon micro安装CTU2，horizon micro需要重做接收RX校准.D、CTU2可用于摩托基站的任何系列中
在繁忙的市中心，一商场角落，需要900MHz的额外覆盖。需要14个TCH，，并且要求发射功率在1W左右。你推荐使用哪一种BTS？（）A、一个室外的M-CELL6B、一个Horizon Macro室内机C、一个Horizon MicroD、一个Horizon Compact
单选题Why does land become desert after all trees are cut down?ABecause nothing remains on land except floods.BBecause there are no longer trees to keep the rain and protect the top-soil.CBecause too much rain sinks in and washes away the top-soil.DBecause roots of the trees break up the soil.
单选题ATo transport water to high places.BTo provide air conditioning.CTo fertilize the soil.DTo adjust the soil temperature.