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【单选题】
据单体结构分析下列物质,既能进行阴离子聚合又能进行阳离子反应的是: ( )A.
苯乙烯
B.
乙烯
C.
丙烯
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【简答题】Now a paper in Science argues that organic chemicals in the rock come mostly from ________ on earth rather than bacteria on Mars. A) configuration B) constitution C) condemnation D) contamination
【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.
A.
configuration
B.
condemnation
C.
constitution
D.
contamination
【简答题】阅读下列代码 - (NSString *)description { return [NSString stringWithFormat:@"%@", self];}下列关于程序执行结果的描述中，正确的是（）。A. 无输出结果 B. 程序陷入死循环 C. 循环引用 D. .无错误
【简答题】autoreleasepool{NSString *per = [[NSString alloc] init];[per retain]; [per retain]; per = @”aa”; [per release];[per release];[per release];}
【单选题】Now a paper argues that organic chemicals in the rock come mostly from ____ on earth rather than bacteria on Mars.
A.
configuration
B.
constitution
C.
condemnation
D.
contamination
【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。
A.
tmp
B.
Documents
C.
Library/Caches
D.
Library/Preference
【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.
A.
configuration
B.
constitution
C.
condemnation
D.
contamination
【简答题】String 与 NSString 的关系与区别
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