矿产发现权属于( )。
A．地质勘察成果专用权
B．矿业权
C．探矿权
D．采矿权
参考答案：B
解析：矿产发现权属于矿业权。
Does his teacher often help him ______ his study?[ ]
A. at
B. on
C. in
D. with
用机上数据装载机下载数据整个过程中,是否需断开系统跳开关?
A、是
B、否
