下列不属于气动胶枪不出胶原因的是（）。
A、气源工作压力过低
B、出胶通道内有固化的胶而未清理
C、选用的胶的粘度过大
D、胶枪的胶嘴开孔过小
参考答案：D
可从（）方面衡量物流服务水准。
A.可得性
B.增值性
C.作业性
D.服务可靠性
Cars X and Y were traveling together on a straight road at a constant speed of 55 miles per hour when car X stopped for 5 minutes. If car Y continued to travel at 55 miles per hour, how many minutes from the time that car X resumed traveling did it take car X traveling at 60 miles per hour to catch up with car Y ？（） (Assume that the time for car X to slow down and speed up was negligible.)
A.5
B.30
C.45
D.55
E.60
