软弹性咬合板
参考答案：软弹性咬合板：是用富有弹性和韧性的弹性义齿材料在真空压膜机上制作而成，戴在上颌使用，要求达到与对颌牙均匀同时接触。
Tom _______ the USA. He _______ back in two months. [ ]
A. has gone to; comes
B. has gone to; will be
C. has been to; comes
D. has been to; will be
国际多式联运
