Trademark is a legal device that grants the inventor of a new product or process exclusive rights for a defined period to the manufacture, use, or sale of that invention.()
Social mobility is the extent to which _____________ can move out of the strata into
The ________ was established to maintain order in the international monetary system.
生奶的抑菌作用在O"C时可保持48小时,()可保持3小时。
A. 30℃
B. 20℃
C. 10℃
D. 5℃