总义齿修复中,作用于唾液与基托之间的力,称为
A.黏附力B.黏固力C.吸引力D.附着力E.黏着力
参考答案:D
I’ll never forget the moment _____I first met Mary and _____ makes me already feel happy.
A.that; that
B.which; what
C.at which; which
D.when; what
我们的身体蕴含着一些物理知识如:我们的手臂实质是一个______杠杆;手掌有花纹是为了______摩擦;食指的指甲宽约为1______(m、dm或cm).