生产延迟的基本原理是______。
A.有效的风险预测
B.保证产品数量的准确性
C.准时化
D.地理延迟
参考答案:C
Our flight to Guangzhou was ________by a bad fog and we had to stay much longer in the hotel than we had expected.
A.delayed
B.adjourned
C.cancelled
D.preserved
有关体育起源的四种学说。