气阀是最容易发生故障的部件，常见故障有（）。
约定转存的储蓄帐户必须凭（）支取。 密码。 印章。 印鉴。 以上都不对。
For a vessel inclined by the wind，multiplying the buoyant force by the horizontal distance between the lines of action of the buoyant and gravity forces gives the（）. righting moment。 vertical moment。 longitudinal moment。 transverse moment。
Many diesel engine exhaust valves are being constructed with hollow stems filled with sodium in order to （） provide added wear protection against today’s corrosive quality of fuel。 increase overall valve strength due to the high gas pressures。 assist in dissipating heat due to the extreme operating temperatures。 reduce the overall weight of the valve thus helping eliminate valve spring surge and hammering。
制动控制模块吊装在车体底架上，每辆车均设有制动控制单元，在Tc车上单独设有（）模块。
从（）识别竞争者开阔了公司的视野，扩大了实际和潜在竞争者的范围，使企业制定出更具竞争性的营销战略。
