下述下颌息止位生理意义不正确的是()。
A.避免牙的面非功能性磨损
B.避免咀嚼肌疲劳
C.避免创伤
D.利于发音
E.使牙周组织得到休息
参考答案:D
Tomorrow is Lucy's birthday. I_______ a present_______ her.
A.want to give; for
B.wants to give; to
C.wants give; for
D.want to give; to
按交易对象网络营销可以分为哪些?