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【单选题】
正常心电轴的范围为A.
0～-30°
B.
0～-90°
C.
0～+90°
D.
-30°～+90°
E.
90～110°
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举一反三
【单选题】Their first discharge of arrows, stones and two-headed darts which ______ any armour covered the ground.
A.
pierce
B.
reign
C.
prick
D.
probe
【单选题】If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause? .
A.
The wearing rings are excessively worn
B.
The suction strainer is clogged
C.
The discharge valve is clogged
D.
The shaft is worn
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