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【单选题】
患儿男,因脐带绕颈,出生呼吸、心跳。其胸外心脏按压的频率是( )A.
60次/分
B.
80次/分
C.
90次/分
D.
100次/分
E.
130次/分
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举一反三
【简答题】带传动的主要失效形式是（）和（），带传动的设计准则是在保证不打滑的条件下，带具有一定的（）。
【单选题】在正常情况下,活塞环的磨损率应不大于( )。
A.
0.1~0.5 mm/kh
B.
0.3~0.5 mm/kh
C.
0.5~0.7 mm/kh
D.
0.7~1.0 mm/kh
【单选题】The train _________ at the present speed until it reaches the next city at about seven o' clock this evening.
A.
will be going
B.
went
C.
would go
D.
went
【简答题】The next year Anna was able to get the city of Philadelphia， where she lived and worked， to proclaim the second Sunday of May as an official Mother‘ s Day——the first city to do so.
【单选题】在正常情况下,活塞环的磨损率应不大于( )。
A.
0.1～0.3 mm/kh
B.
0.3～0.5 mm/kh
C.
0.5～0.7 mm/kh
D.
0.7～1.0 mm/kh
【单选题】--- What are you busy with? ---The exhibition ____ in the city next week．
A.
held
B.
will be held
C.
to be held
D.
being held
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