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【单选题】
单人心肺复苏时，胸外心脏按压与人工呼吸的恰当操作是A.
心脏按压6次，口对口人工呼吸1次
B.
心脏按压5次，口对口人工呼吸1次
C.
心脏按压12次，口对口人工呼吸2次
D.
心脏按压15次，口对口人工呼吸2次
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反馈参考答案：
举一反三
【单选题】The teather told us yesterday that December 25____Christmas Day.
A.
Is
B.
Was
C.
Has been
D.
Will be
【单选题】Let's listen to the radio programme that the teather mentioned, ?
A.
do we
B.
don't we
C.
shall we
D.
shan't we
【单选题】The teather felt so angry with the students for being late that she( )them ( ).
A.
shut,out
B.
found,out
C.
struggled,for
D.
pull,back
【单选题】Mary is _______ than a teather; she is a writer, too.
A.
more
B.
less
C.
most
D.
least
【单选题】The teather suggested that he_______the plan.
A.
would change
B.
changed
C.
change
D.
changes
【单选题】零件表面粗糙度参数值的选用,应该既要满足零件表面的功能要求,又要考虑经济合理性。在满足功用的前提下,应尽量选择 ( )表面粗糙度参数值,以降低生产成本。
A.
较大的
B.
较小的
【单选题】零件表面粗糙度参数值的选用,应该既要满足零件表面的功能要求,又要考虑经济合理性。在满足功用的前提下,应尽量选择______表面粗糙度参数值,以降低生产成本。
A.
较大的
B.
较小的
C.
随便选
【单选题】The teather criticized the students who _____ school for many times.
A.
hadstayed up
B.
stayed way
C.
had stayed away from
D.
had stayed out
【单选题】During the first class,the teather laid____on the importance of education.
A.
books
B.
voices
C.
stress
D.
talks
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