下列关于算术函数的说法，正确的是( )。
A．Rnd[(number)]用来获得大于等于0，但小于1的双精度随机数
B．Trim(string)只能用宋删除String字符串末尾空格
C．Str(number)用来将number转换为字符串，非负数以+开头，负数以—开头
D．Chr(charcode)用来返回charcode所对应的字符，其中charcode为ASCII码
参考答案：D
解析：本题考查Access中算术函数的概念。 Rnd[(numbe0)用来获得大于等于0，但小于1的单精度随机数，而不是双精度数；Trim(string)不仅删除string字符串末尾空格，而且删除前导空格；Str(number)用来将number转换为字符串，非负数以空格开头，负数以负号开头。答案为D。
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