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【单选题】
发动机安装螺旋桨时主要是看螺旋桨推力(拉力)与（ ）的关系。
A.
转速
B.
重量
C.
体积
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举报参考答案：
举一反三
【单选题】螺旋桨推力功率THP为()。
A.
船舶主机发出的功率与传递效率的乘积
B.
螺旋桨发出的推力与螺旋桨进速(对水)的乘积
C.
螺旋業发出的推力与船速(对水)的乘积
D.
船舶阻力与船速的乘积
【单选题】Amphibious vehicles, those that can move on both land and water, have been in use for a number of years, but while most of them were fairly fast on land, they moved quite slowly when they were functio...
A.
the sidewall ACV
B.
Mountbatten Class hovercraft
C.
Cockerell’s ACV
D.
Sedam N500
【单选题】Amphibious vehicles, those that can move on both land and water, have been in use for a number of years, but while most of them were fairly fast on land, they moved quite slowly when they were functio...
A.
are moved forward by propellers
B.
travel on a cushion of air
C.
are lifted up by a flexible rubber "skirt"
D.
move faster on land than on water
【单选题】变频器可以用来将恒压恒频的交流电转变成________,从而控制推进电机的转速大小和方向,使得螺旋桨推力大小和正倒车可调,实现电力推进无级调速。
A.
频率变化、电压变化的交流电
B.
频率不变、电压变化的交流电
C.
频率变化、电压不变的交流电
D.
频率不变、电压变化的直流电
相关题目：
【单选题】螺旋桨推力功率THP为()。
A.
船舶主机发出的功率与传递效率的乘积
B.
螺旋桨发出的推力与螺旋桨进速(对水)的乘积
C.
螺旋業发出的推力与船速(对水)的乘积
D.
船舶阻力与船速的乘积
【单选题】Amphibious vehicles, those that can move on both land and water, have been in use for a number of years, but while most of them were fairly fast on land, they moved quite slowly when they were functio...
A.
the sidewall ACV
B.
Mountbatten Class hovercraft
C.
Cockerell’s ACV
D.
Sedam N500
【单选题】Amphibious vehicles, those that can move on both land and water, have been in use for a number of years, but while most of them were fairly fast on land, they moved quite slowly when they were functio...
A.
are moved forward by propellers
B.
travel on a cushion of air
C.
are lifted up by a flexible rubber "skirt"
D.
move faster on land than on water
【单选题】变频器可以用来将恒压恒频的交流电转变成________,从而控制推进电机的转速大小和方向,使得螺旋桨推力大小和正倒车可调,实现电力推进无级调速。
A.
频率变化、电压变化的交流电
B.
频率不变、电压变化的交流电
C.
频率变化、电压不变的交流电
D.
频率不变、电压变化的直流电
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