Mrs. Smith has ______ son and a daughter. [ ]
A. a
B. an
C. the
答案:B
But now we play _____ our own songs. [ ]
A. mostly
B. most
C. the most
D. more most
再结晶晶粒长大的过程中,晶粒界面的不同曲率是造成晶界迁移的直接原因,晶界总是向着()方向移动。
A.曲率中心
B.曲率中心相反
C.曲率中心垂直