08-475型道岔捣固车捣固装置除振动油马达外，夹持及升降油缸的动作均为（）。
参考答案：间歇式
—Who ______ Lily and Tim ______ ?
—Their mother. [ ]
A. is; waiting
B. are; waiting
C. is; waiting for
D. are; waiting for
