慢性心房颤动伴二度房室传导阻滞者，应首选的起搏器型号是（）
A．ICD型
B．VVI型
C．AAI型
D．VOO型
参考答案：B
A fire broke out in the building at about 7:30 on Tuesday morning, _____ in the death of a
young girl.
A．having resulted
B．resulted
C．being resulted
D．resulting
余热锅炉一般用作（）。
A、发生饱和蒸汽
B、过热饱和蒸汽
C、预热原料油
D、预热除氧水
