由于观测者粗心或者受到干扰造成的错误称为( )。
A.随机误差 B.偶然误差C.粗差 D.变态误差
参考答案:C
Lin Li had a bad cold. The doctor asked her _____ at home. [ ]
A. stay
B. to stay
C. stayed
D. staying
患者,缺失,义齿设计:基牙,弯制卡环,塑料基托连接。义齿蜡型采用混装法装盒,该义齿牙托粉的用量约为()
A.0.5ml
B.2ml
C.4ml
D.1~1.5ml
E.3ml