Where should the tops of vents from gasoline tanks terminate?（）. ["In open air","Inside cabins near the overhead","In the machinery space near the engine air intake","Underwater"]
对重要的碳钢、合金钢焊接件，为消除热影响区的不利影响，采用的热处理方法是（） ["退火","正火","回火","淬火"]
显著性水平表达了区间估计的（）。 ["可靠性","不可靠的概率","准确性","有效性"]
Where is thicker plating usually found in the construction of integral tanks on a ship? （） ["On the outside of the tank","At the bottom of the tank","At the top of the tank","At the center of the tank"]
对低碳钢和高强度低合金钢焊接接头破坏一般首先出现在（） ["母材内","焊缝内","热影响区内","正火区内"]
什么是外径千分尺？它的用途是什么？
