在日常经营管理中,为了改进员工工作表现所采取的最有效的手段是()? ["表扬","监控","批评","鼓励"]
()属于植物性香料。 ["玫瑰香","麝香","龙涎香","灵猫香"]
城市似大地水准面以满足()比例尺地形图测制为基本应用目的。 ["A.1:5000","B.1:2000","C.1:1000","D.1:500"]
下放电缆时,下列说法正确的是() ["电缆正下方严禁站人","拖拽人员保持一定距离排开","统一步调,速度均匀拖电缆"]
()不属于动物性香料。 ["海狸香","灵猫香","麝香","树脂"]
C51特有的数据类型有哪些?