皮皮学，免费搜题
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搜题
【单选题】
数控机床的组成部分是( )。A.
(A)硬件、软件、机床、程序
B.
(B)数控装置、主轴驱动、主机及辅助设备
C.
(C)I/O、数控装置、伺服系统、机床主体及反馈装置
D.
(D)I/O、数控装置、控制软件、主机及辅助设备
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皮皮学刷刷变学霸
举一反三
【单选题】The teacher felt very glad at the great ________ the students made in their studies. [ ]
A.
search
B.
progress
C.
strength
D.
treasure
【多选题】以下机型代号正确的是( )
A.
EMB145庞巴迪 ERJ
B.
AirbusA340 :340
C.
EMB145庞巴迪 CRJ
D.
AirbusA330 :B330
【单选题】The students made heated discussions ______ the education system.
A.
as to
B.
due to
C.
owing to
D.
with regard
【判断题】An eosinophil is a leukocyte readily stained with basic dyes such as eosin._____
A.
正确
B.
错误
【单选题】Which sentence explains when the students made the sandwiches?
A.
On April 1, students in California helped those in need in their community.
B.
The world record for most sandwiches made in three minutes was 490.
C.
The school's parents club planned the sandwich event.
D.
They would be delivered to the Alpha Project later that day.
【简答题】如图，直线AB∥CD，EF分别交AB、CD于点M、G，MN平分∠EMB，GH平分∠MGD，求证：MN∥GH． 证明：∵AB∥CD（已知） ∴∠EMB=∠EGD（ _________ ） ∵MN平分∠EMB，GH平分∠MGD（已知） ∴∠1= ∠EMB，∠2= ∠MGD（ _________ ） ∴∠1=∠2 ∴MN∥GH（ _________ ）
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