【单选题】二层办公室的楼面面层采用( )。 (2.5)

【单选题】Now a paper in Science argues that organic chemicals in the rock come mostly from ______ on earth rather than bacteria on Mars.

【判断题】在swift里面String和NSString都是继承NSObject类型的。（ ）

【单选题】二层办公室的楼面面层采用( )。 图纸.zip

【判断题】NSString的接口定义如下： @interface NSString : NSObject 从它的接口看出它并没有遵守NSCoding协议，所以默认不能归档和反归档。

【单选题】Now a paper argues that organic chemicals in the rock come mostly from ____ on earth rather than bacteria on Mars.

【单选题】阅读以下一段代码: NSString *home = NSHomeDirectory(); NSString *documents = [home stringByAppendingPathComponent:@"Documents"]; 分析代码可知,它的目的在于获取()目录。

【单选题】Now a paper in Science argues that organic chemicals in the rock come mostly from ________ on earth rather than bacteria on Mars.

【简答题】阅读以下一段代码： NSString *home = NSHomeDirectory(); NSString *documents = [home stringByAppendingPathComponent:@"Documents"]; 分析代码可知，它的目的在于获取（）目录。A. tmp B. Documents C. Library/Caches D. Library/Preferen...

【简答题】String 与 NSString 的关系与区别