【单选题】在单元格中直接输入数字,一般数字默认靠( )
【单选题】Every human being has a【C1】______ arrangement of the skin of his fingers and this arrangement is unchangeable. Scientists and experts have proved the uniqueness of fingerprints and discovered that【C2】...
【单选题】In such a background, his white hair was particularly his dark skin.
【简答题】Every human being has a unique ① arrangement of the skin on his fingers and this arrangement is unchangeable. Scientists and experts have proved the uniqueness of finger-prints and discovered that no ...
【单选题】化学与生产、生活、社会密切相关,下列说法正确的是 [ ]
A.
钢筋混凝土、玻璃钢、石棉瓦、碳纤维增强陶瓷都是常见的复合材料
B.
蛋白质、棉花、核酸、PVC、淀粉、油脂都是由高分子组成的物质
C.
淀粉和纤维素,都可用(C 6 H 10 O 5 ) n 表示,但淀粉能发生银镜反应,而纤维素不能
D.
煤经气化和液化两个物理过程后可变为清洁能源,这是煤综合利用的主要方法