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【单选题】
螺旋桨产生负拉力的原因有：（）.
A.
（A）桨叶角过大，飞行速度过小
B.
（B）桨叶角过大，飞行速度过大
C.
（C）油门过大，飞行速度过小
D.
（D）油门过小，飞行速度过大
参考答案：
参考解析：
刷刷题刷刷变学霸
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
相关题目：
【单选题】钢丝绳的允许拉力等于()。
A.
破断拉力×安全系数
B.
破断力
C.
破断力/安全系数
【单选题】船舶脱浅所需拉力与（）有关。
A.
船舶排水量
B.
主机功率
C.
搁浅后损失的排水量及船与海底的摩擦系数
D.
船型
【单选题】螺旋桨的效率是_____
A.
指示功率与有效功率之比值
B.
螺旋桨的有效功率与消耗功率之比
C.
消耗功率与发出的功率之比
D.
指示功率与桨吸收功率之比
【单选题】165使用螺旋桨技术最主要的目的是
A.
降低人体射频能量的积累
B.
保证了图像的时间分辨力
C.
减少运动伪影
D.
减少带状伪影
E.
降低SNR
【单选题】螺旋桨常用的材料是________。
A.
特殊锰黄铜
B.
铅青铜
C.
铸铁
【单选题】螺旋桨桨叶扭转的目的是（）。
A.
使从桨根到桨叶尖各剖面的的桨叶迎角基本相同
B.
使从桨根到桨叶尖的拉力大小基本相同
C.
使从桨根到桨叶尖的桨叶角大小基本相同
【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】V带 承受拉力的主要部分 是( )。
A.
强力层
B.
拉伸层
C.
压缩层
D.
包布层
【单选题】JH—28型回柱机其最大拉力约为（）吨。
A.
14
B.
28
C.
10
【单选题】A.Na=0 B.Na=10(拉力) C.Na=10(压力) D.(拉力)
A.
如图3-171所示结构中杆a的内力Na(kN)应为下列哪项（）
B.
【单选题】内部解锁拉力为（ ）
A.
≤100N
B.
≤110N
C.
≤120N
D.
≤130N
【单选题】螺旋桨的（）为螺旋桨主要的几何参数。
A.
叶数
B.
直径
C.
螺距
D.
叶数、直径和螺距
【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
【多选题】链传动中,紧边拉力包括( )。
A.
有效拉力
B.
离心拉力
C.
悬垂拉力
D.
摩擦力