相关考题
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问答题
质量信息有什么作用？ -
单项选择题
As you approach mile 427.6 AHP，you see on the right side a white buoy with orange bands and diamond. This buoy marks（）.
A.a cable crossing
B.a sunken barge
C.a submerged discharge pipe
D.the end of a wharf -
判断题
侧拉门的驱动机构为带有缓冲机构的直动式气缸。
