慢性纤维硬化性甲状腺炎
A．"铅管"征B．"鹅卵石"征C．"鸟嘴"征D．"杯口"征E．充盈缺损
参考答案：A
The trouble is that not many students really know how to make use of their ______ time to its best
A．benefit
B．advantage
C．value
D．profit
韶山3型、韶山4型机车通过的最小曲线半径为（）。
