会发生"风化"的药物是()
A.石膏
B.朱砂
C.龙骨
D.雄黄
E.芒硝
参考答案:E
下列哪个选项是正确计算角度42°的余弦值( )
A.double d = Mat cos(42);
B.double d = Mat cosine(42);
C.double d = Mat cos(Mat toRadians(42));
D.double d = Mat cos(Mat toDegrees(42));
下述上颌第二前磨牙与上颌第一前磨牙形态区别中错误的是()
A.上颌第二前磨牙的颊尖比较圆钝
B.上颌第二前磨牙在近中面无近中沟
C.上颌第二前磨牙牙颈外形略宽
D.上颌第二前磨牙多为扁形双根
E.上颌第二前磨牙邻面更圆凸