必有订单业务是指直运采购订单必须参照直运销售订单建立,但直运采购发票可不必参照直运采购订单。
参考答案:错
In the first half of the match, Number 52 Middle School _______ us 5-3, but at last our team _______ the match.
A. beat; win
B. win; beat
C. beat; won
D. won; beat
光纤色散主要是模式色散、()色散和波导色散。