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定义了一个长度为12的一个double变量，为何在watch window里只能看到7位有效数字？是这个变量没被定义成double还是watch window 只能观察float型的变量？
C2000的浮点运算单元应该是只能处理单精度浮点而已。
ERIC
看看附件数据类型
