【单选题】
()为合法的常量。
①
<imgwidth="53"height="26"v:shapes="图片_x0020_92"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image095.png">
②
<imgwidth="34"height="16"v:shapes="图片_x0020_93"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image096.png">
③
<imgwidth="59"height="22"v:shapes="图片_x0020_94"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image097.png">
④
<imgwidth="31"height="23"v:shapes="图片_x0020_95"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image098.png">
【单选题】
()为非法的字符串常量。
①
<imgwidth="22"height="26"v:shapes="图片_x0020_119"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image122.png">
②
<imgwidth="25"height="24"v:shapes="图片_x0020_120"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image123.png">
③
<imgwidth="29"height="24"v:shapes="图片_x0020_121"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image124.png">
④
<imgwidth="52"height="29"v:shapes="图片_x0020_122"src="http://wljy.whut.edu.cn/uploadfiles/word/cyy01-60.files/image125.png">