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立式加工中心（vertical machining center）共有三个坐标轴，其控制主要由PLC完成。
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考题
Of the following, the most important consideration for a tank vessel is ______.A.GMB.the vertical center of gravityC.the longitudinal center of gravityD.the stress on the hull
考题
The righting moment can be determined by multiplying the displacement by the ______．A.vertical center of gravity（KG）B.longitudinal center of gravity（LCG）C.righting arm（GZ）D.center of gravity（CG）
考题
With no environmental forces acting on the vessel，the center of gravity of an inclined vessel is vertically aligned with the ______．A.longitudinal centerlineB.center of flotationC.original vertical centerlineD.metacenter
考题
Of the following，the most important consideration for a tanker is ______．A.GMB.The vertical center of gravityC.The longitudinal center of gravityD.The stress on the hull
考题
Aboard a vessel, dividing the sum of the vertical moments by total weight yields the vessel’s_____.A.height of the center of gravityB.vertical momentsC.righting momentsD.inclining moments
考题
At all angles of inclination, the metacenter is ______.A.vertically above the center of buoyancyB.vertically above the center of gravityC.at the intersection of the upright vertical centerline and the line of action of the buoyant forceD.at the geometric center of the underwater volume
考题
加工中心按工艺用途分类有（）。A、卧式加工中心、立式加工中心和龙门式加工中心B、镗铣加工中心、钻削加工中心、车削加工中心和复合加工中心C、半闭环控制加工中心和全闭环加工中心D、带刀库、机械手的加工中心、无机械手加工中心和转塔刀库式加工中心
考题
加工中心按数字控制伺服机构的种类分类有（）。A、卧式加工中心、立式加工中心和龙门式加工中心B、镗铣加工中心、钻削加工中心、车削加工中心和复合加工中心C、半闭环控制加工中心和全闭环加工中心D、带刀库、机械手的加工中心、无机械手加工中心和转塔刀库式加工中心
考题
单选题The center of flotation of a vessel is（）.A
the center of volume of the immersed portion of the vesselB
the center of gravity of the water planeC
that point at which all the vertical downward forces of weight are considered to be concentratedD
that point at which all the vertical upward forces of buoyancy are considered to be concentrated
考题
单选题The center of buoyancy is located at the（）.A
geometric center of the waterplane areaB
intersection of the vertical centerline and line of action of the buoyant forceC
center of gravity of the vessel corrected for free surface effectsD
geometric center of the displaced volume
考题
单选题At all angles of inclination，the metacenter is（）.A
vertically above the center of buoyancyB
vertically above the center of gravityC
at the intersection of the upright vertical centerline and the line of action of the buoyant forceD
at the geometric center of the underwater volume
考题
单选题0f the following, the most important consideration for a tank vessel is（）.A
GMB
the vertical center of gravityC
the longitudinal center of gravityD
the stress on the hull
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