指出下面哪些是合法的用户定义的标识符______
以下是正确的C语言标识符是________。
以下不正确的C语言标识符是________。
以下不正确的C语言标识符是________。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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