在存有易爆炸、易燃物的舱内及在燃料油舱、煤舱内,应采用() ["一般形式的行灯","防爆灯具","日光灯","白炽灯"]
喷射混凝土的粘结强度对于Ⅳ类及以上岩石大于:() ["1MPa","0.8MPa","0.1MPa","0.5MPa"]
明清宫殿(),现称故宫,位于北京城中轴线中段,东西760米,南北960米。 ["大明宫","紫禁城","汴梁宫","麟德殿"]
下列哪个因素有助于解释当前团队为何如此普及?() ["团队更容易管理","团队更好地利用员工的人才","团队建设的成本低","团队促进社会化和凝聚力","团队大大提高效率"]
In the reign of William I,the()were at the bottom of the feudal scale. ["knights","villeins","lesser nobles","freeme"]
什么是字符?举例说明字符的具体类别。