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完成下面证明： （1）如图1，已知直线b ∥ c，a⊥c，求证：a⊥b 证明：∵a⊥c （已知） ∴∠1=______（垂直定义） ∵b ∥ c （已知） ∴∠1=∠2 （______） ∴∠2=∠1=90° （______） ∴a⊥b （______） （2）如图2：AB ∥ CD，∠B+∠D=180°，求证：CB ∥ DE 证明：∵AB ∥ CD （已知） ∴∠B=______（______） ∵∠B+∠D=180° （已知） ∴∠C+∠D=180° （______） ∴CB ∥ DE （______）
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举一反三
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A.
on which
B.
at which
C.
through which
D.
in which
【简答题】根据体型大小,贵宾犬分为 、 、 三种类型。
【单选题】What did the farmer do all day?
A.
He pulled cars out of the hole in the road.
B.
He filled the hole with water.
C.
He worked on his farm.
【单选题】某小儿 4个月,接种百白破三联疫苗12小时,体温37.2°C,局部红、肿、热、痛,红肿直径2.0cm,该小儿应考虑为:
A.
接种后全身反应
B.
接种后局部弱反应
C.
过敏性休克
D.
晕针
E.
接种后局部强反应
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【单选题】42 He knows ______ a lot more than Wagner ______ be able to pick a hole in his work offhand.
A.
such ... as to
B.
so ....as to
C.
such ...so as to
D.
too...as to
【单选题】The hiding man made a hole in the wall ______ he could observe the outside. [ ]
A.
in which
B.
by which
C.
through which
D.
with which
【单选题】某小儿4月,接种白日破三联疫苗12小时,体温37°C,局部红、肿、热、痛,红肿直径2.0cm,该小儿应考虑为:
A.
接种后全身反应
B.
接种后局部弱反应
C.
过敏性休克
D.
晕针
E.
接种后局部强反应
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