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【单选题】
关于房颤的心电图改变下列错误的是A.
心房率350～600次/分
B.
心室率不规则
C.
快速房颤室率可达180～250次/分
D.
可出现室内差异性传导
E.
伴R-R>1.5s常提示存在二度房室传导阻滞
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反馈参考答案：
举一反三
【单选题】The terms under which the shipowner is not responsible for loading and discharging stowage and trimming costs is ()
A.
FOBST
B.
FIOST
C.
FIOS
D.
FIO
【简答题】The terms under which the ship owner is not responsible for loading，discharging，stowage and trimming COSTS is（ ）．
【单选题】In some countries, contracts for export are mostly signed under CIF terms because ( ).
A.
CIF terms involve fewer risks
B.
CIF terms involve fewer expenses
C.
Under CIF terms, it is sometimes more efficient that the exporter is responsible for arranging both the transportation and the insurance
D.
some exporters are accustomed to CIF terms
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