调整短行程电磁铁衔铁行程时，扳手紧固螺母时，可以减小行程，反之，松开螺母即可增大行程。
参考答案：对
病历、处方保存的期限规定有哪些？
It was ________ your timely help that we accomplished the task on time. [ ]
A. as to
B. thanks to
C. but for
D. ought to
