企业代号可用（）组成。
A、汉语拼音字母
B、汉语拼音字母或阿拉伯数字
C、阿拉伯数字
D、汉语拼音字母或阿拉伯数字或两者兼用
参考答案：D
社会语言学研究对象。
Which of the following statements about Standard Ⅵ (C), Referral Fees, is TRUE（）
A. Referral fees must be disclosed after proceeding with an agreement for service.
B. Referral fees may be disclosed before or after proceeding with an agreement for service.
C. Referral fees must be disclosed before proceeding with an agreement for service.
