题目内容

斗式提升机的料斗的种类和应用、料斗的安装方式、提升机的卸料方式及应用

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隧道内影响司机视觉的主要因素有() ①适宜的亮度; ②观察时间的长短; ③观察对象的大小; ④颜色及其背景的对比度; ⑤行车时速的大小

A. ①②③④⑤
B. ①②④⑤
C. ①③④⑤
D. ①②③⑤

凸轮机构中的平底从动杆,可以用于具有内凹轮廓曲线的凸轮。

A. 正确
B. 错误

凸轮机构中从动杆的运动规律,取决于凸轮轮廓曲线或凹槽曲线的形状。

A. 正确
B. 错误

At 0845,you are approaching the entrances to Thimble Shoal Channel. What channel must you use?()

A. The South Auxiliary Channel since your draft is less than 25 feet (7.6 meters),and you are not a passenger vessel
B. The South Auxiliary Channel or Thimble Shoal Channel,but you must remain on the right hand side of the main channel
C. The North Auxiliary Channel since you are going to turn to a northerly heading near buoy "12"
D. You are not permitted to use any of the channels,but must remain outside the buoyed channel line

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