如果花键配合后滑动不灵活，可用（）修整花键孔。
A、刮刀
B、锉刀
C、花键推刀
D、钢锯
参考答案：C
The washing machine is of excellent quality. If there __________ be any problem within the first three years, we would fix it for free.
A．could
B．might
C．shall
D．should
客人抵店后（）小时之内，留宿单位将《临时住宿登记表》送交公安机关。
A.10
B.12
C.18
D.24
