皮皮学，免费搜题
登录
搜题
【简答题】
如图，已知等腰三角形△ABC，其中AB=AC，∠CAB=40°， （1）作底角∠ABC的平分线BD，交AC于点D（要求用尺规作图，不用写作法，但要保留作图痕迹） （2）请计算∠BDC的度数．
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】there are two types of vibrations, they are vertical vibration and vibration.
A.
horizontal
B.
lateral
C.
vertical
D.
longitudinal
【单选题】An ILS consists of two independent sub-systems, one providing _____ guidance (Localizer), the other _____ guidance (Glide slope or Glide Path) to aircraft approaching a runway. A. lateral, lateral ...
A.
lateral, lateral
B.
lateral, vertical
C.
vertical, lateral
D.
vertical, vertical
【单选题】The vertical angle between the horizontal and the magnetic line of force is the（）.
A.
elevation
B.
magnetic angle
C.
vertical angle
D.
dip
【单选题】A single vertical magnet placed underneath the compass in the binnacle is used to compensate for（）.
A.
the horizontal component of the permanent magnetism
B.
deviation caused by the vessel's inclination from the vertical
C.
induced magnetism in the horizontal soft iron
D.
induced magnetism in the vertical soft iron
【单选题】Aboard ship, vertical flat plates running transversely and connecting the vertical keel to the margin plates are called ______.
A.
floors
B.
intercostals
C.
girders
D.
Stringers
【单选题】A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______．
A.
The horizontal component of the permanent magnetism
B.
Deviation caused by the vessel's inclination from the vertical
C.
Induced magnetism in the horizontal soft iron
D.
Induced magnetism in the vertical soft iron
相关题目：