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【单选题】
单 片机的哪一个并行端口的引脚具有第二功能。A.
P1
B.
P2
C.
P3
D.
P0
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反馈参考答案：
举一反三
【简答题】Usually motor carriers compete with air for small shipments and rail for ____________ 。
【简答题】The versatility of motor carriers is made possible in that they can transport products of ____________ and weight over any distance。
【简答题】Rail transport has disadvantages compared to motor carriers in terms of __________ and frequency of service。
【简答题】Motor-freight carriers are less __________(advantage) for transport of low-value goods.
【简答题】Motor carriers are more ________________ than other modes。
【简答题】Loss and damage ratios for motor carriers are substantially lower than for rail and are slightly higher than for ____________
【简答题】Motor carriers are flexible in that they can offer _______________ service between almost any origin-destination combination。
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