有5台机器,每台重400千克,用一辆载重3吨的卡车来运,超载了吗?
3吨=3000千克,
5×400=2000(千克),
2000千克<3000千克,
答:不超载.
Millions of pounds’ worth of damage ___by a storm which swept across the north of England last night.
A.has been caused
B.had been caused
C.will be caused
D.will have been caused
心电图表现为ORS波群正常;PR间期进行性延长,直至一个P波受阻。不能下传心室,见于()
A.二度Ⅰ型房室传导阻滞
B.二度Ⅱ型窦房传导阻滞
C.三度房室传导阻滞
D.二度Ⅱ型房室传导阻滞
E.一度房室传导阻滞