【单选题】The International Oil Pollution Prevention Certificate is valid for a period of ______. prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
one year from the date of issue
B.
four years from the date of issue prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
C.
three years from the date of issue
D.
five years from the date of issue prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
【简答题】Now how do we get to augmented reality? Step one is the step I'm wearing right now, Google Glass. I'm sure many of you are familiar with Google Glass. What you may not be familiar with is that Google ...