对全口义齿的固位和支持有利的粘膜情况是（）
A.厚、松软
B.厚、韧
C.薄
D.薄、干燥
E.B或D
参考答案：B
垂直于半径的直线是圆的切线．说法是：______的．（判断对错）
“The interest ________ be divided into four parts, according to the contract between the two sides,” declared the judge.
A．may
B．should
C．can
D．shall
