简述构成有效接受的条件。
参考答案:(1)接受必须是受盘人作出的; (2)接受必须明示; (3)接受必须同意发盘提出的交易条件; (4)必须在规定的期限内送达发盘人。
计算物体的长度,常用米、______、厘米或______做单位.
Speaker A: Hello! Professor Freeman’s secretary. Can I help you Speaker B: ().
A. Hello! Can you find Professor Freeman for me
B. Yes. I hope you can help me. My name is John Smith.
C. Good afternoon I’d like to make an appointment to see the professor on Thursday, please.
D. Thank you. Professor Freeman knows me well.