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【单选题】
某妇女流产后出现月经不调,疑诊为萎缩不全。子宫内膜活检结果,支持拟诊依据的是( )
A.
增殖期内膜
B.
大量分泌期内膜
C.
内膜呈囊性增生
D.
少量分泌期内膜
E.
炎性子宫内膜
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【单选题】在坐标镗床上镗削圆锥角为a的圆锥孔时,镗刀的轴向进给量L与镗刀的径向进给量H需要保持规定的比值()。
A.
tan a = H/L
B.
tan =H/L
C.
=H/L
D.
=H/L
【单选题】The only practical method of maintaining a constant voltage output from an aircraft generator under varying conditions of speed and load is to vary the _______________.
A.
strength of the magnetic field
B.
number of conductors in the armature
C.
speed at which the armature rotates
D.
brush pressure on the commutator segments
【单选题】安装visual foxpro 时,错误的操作是( )
A.
先关闭防病毒程序,再安装visual  foxpro
B.
先启动防病毒程序,再安装visual  foxpro
C.
在“最终用户许可协议”对话框中,必须选中“接收协议”单选按钮
D.
系统安装完成后,再安装visual  foxpro 的示例和帮助系统
【单选题】在坐标镗床上镗削圆锥角为α的圆锥孔时,镗刀的轴向进给量L与镗刀的径向进给量H需要保持规定的比值()。
A.
tanα=
B.
tan=
C.
sinα=
D.
cosα=
【单选题】The speed of a synchronous machine is directly proportional to () in its armature under steady-state conditions
A.
the amplitude of the current
B.
the frequency of the current
C.
the amplitude ofthe voltage
D.
the flux
【判断题】In the under-voltage state, there are two peaks in the current ic. ( )
A.
正确
B.
错误
【判断题】产生重力地质作用的动力来源于内外两个方面:块体内部的重力与外部的触发力。
A.
正确
B.
错误
【判断题】In the under-voltage status, there are two peaks in the current i c.
A.
正确
B.
错误
【单选题】For two AC contactors of the same type, the rated voltage of the coil is 220V. If the coils of the two contactors are used in series under the voltage of 220V, the main contact ( ).
A.
both don't act
B.
one acts, another not
C.
both acts
D.
None of  the above is correct
【单选题】某船夜间航行,航向002º,海图上在航线左正横附近及左前方有标注灯塔的两个小岛,查灯标表得:左正横A岛的灯塔为:F1(2)6s 10M备注栏:W060º~150º(090º)。左前方B灯塔为:F1(2)5s 13M,则该船驾驶员用罗经:
A.
可先测B后测A灯塔定位
B.
可测B灯塔,无法测A灯塔
C.
可测A灯塔、无法测B灯塔
D.
可按任意顺序观测A.B灯塔
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