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【单选题】
从下图所示逻辑图中，选出不能实现“异或”逻辑关系的一项为_____。【图片】A.
图(1)
B.
图(2)
C.
图(3)
D.
图(4)
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举一反三
【简答题】中成药的分类有ACDE (A)按病证分类 (B)按组成分类 (C)按临床科属分类 (D)按功能分类(E)按剂型分类
【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】关于NSString类型的描述中,哪一项是错误的?
A.
NSString 是Objective-C中的类
B.
NSString 类型的常量，必须用双引号引起来，并加@字符，如：@”hello”
C.
NSString 类型与C语言的字符串类型之间可以相互转换
D.
使用NSLog输出字符串，用%s作为输出变量的格式符
【简答题】阅读理解 Take any long piece of paper. Now glue the ends of the paper together. You have made a ring. Take a second long piece of paper. Twist the paper once and glue the ends together. Now you have made ...
【简答题】autoreleasepool{NSString *per = [[NSString alloc] init];[per retain]; [per retain]; per = @”aa”; [per release];[per release];[per release];}
【单选题】—Where is the paper I put on the table just now? —Sorry. I thought it was paper and threw it away. [ ]
A.
waste
B.
helpful
C.
useful
D.
beautiful
【单选题】______ over 100 years since the invention of the square-bottomed paper bag.
A.
Now is
B.
Now it has
C.
There is now
D.
It is now
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