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【单选题】
完全性左阻滞最具特征性的改变为( )A.
额面QRS心电轴左偏
B.
QRS波群时限≥0.12s
C.
V 5 导联R峰时间>0.06s
D.
V5 、 V6、I、avL 导联R波增宽有切迹，无q波
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举一反三
【单选题】In a two-stroke engine the camshaft rotates at____ the engine rotational speed.
A.
half
B.
twice
C.
the same speed as
D.
four times
【单选题】At least ( ) cylinders in a two-stroke engine will be configured to ensure thatthe engine can be started with crankshaft at whatever position
A.
4
B.
6
C.
12
【单选题】Each cylinder in a two stroke cycle engine experiences combustion（）.
A.
once each crankshaft revolution
B.
twice each crankshaft revolution
C.
every other crankshaft revolution
D.
every fourth stroke
【单选题】In a two-stroke engine, there are always a series of openings known as , and in some circumstances, there are also openings known as , in the part of the cylinder liner.
A.
scavenging air ports; exhaust ports
B.
inlet ports; scavenging air ports
C.
scavenging air ports; inlet ports
D.
exhaust ports; inlet ports
【单选题】My grandfather is such a forgetful person that he has to _______ many things, even his daily meals. [ ]
A.
be remembered by
B.
be reminded of
C.
be memorized
D.
be reminded
【单选题】In two-stroke engine the crankshaft is connected with ____ by means of the connecting rod.
A.
the stuffing box
B.
the piston
C.
the crosshead
D.
guide plate
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