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。
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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
铣床是专门用于木料加工表面加工的机械，是木材加工必不可少的基本设备。
A. 正确
B. 错误
按照《工程建设项目施工招标投标办法》和《工程建设项目货物招标投标办法》等有关规定，资格审查方法分为（）。
A. 资格预审和资格后审
B. 组建委员会和编制资格审查文件
C. 评估审查和资格评审
D. 资格预审和资格核准
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