计算:(-a)2-(a2)2÷a3=______.
原式=a2•a4÷a3=a3.
故答案为:a3
29. A big earthquake hit Yushu, Qinghai province in the early morning, and if a little later, many more people _______.
A.could survive
B.might have survived
C.must have survived
D.should survive
女性,22岁,家人发现昏迷在床上而急送医院。据说患者近来工作很不顺利,既往体健。体格检查:BP90/60mmHg,双瞳孔等大,直径3mm。呼吸时有酒味,心肺正常,应立即采取的抢救措施是()
A.吸氧
B.大量输液
C.洗胃
D.利尿
E.静脉滴注纳洛酮