实际轮廓线对理想轮廓线所允许的变动量称为（）公差。
A、面轮廓度
B、直线度
C、不直度
D、线轮廓度
参考答案：D
He made _____ experiments to prove his theory, and the number _____ added up to 600.
A．a large number of ;have
B．a great deal of; has
C．a great many; has
D．plenty of; have
