用涡流法测量非金属涂层厚度的机理是（）。
A.末端效应
B.速度效应
C.涡流热效应
D.提离效应
参考答案：D
Jim didn’t realize his little sister was crying _____ what he had said.
A．because
B．because of
C．as
D．since
专业技术职务任职最高年龄是怎样规定的？
