皮皮学，免费搜题
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搜题
【单选题】
人由蹲突然直立时,头晕、眼黑的原因是:A.
小动脉扩张,外阻力降低
B.
骨骼肌的挤压作用
C.
重力作用使大量血液滞留于下肢静脉,回心血量减少
D.
心肌收缩力减弱
E.
贫血
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【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
【简答题】The students made a _____ (compare) of different cultures.
【简答题】英译汉:eosin
【单选题】The students made heated discussions ______ the education system.
A.
as to
B.
due to
C.
owing to
D.
with regard
【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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