如果单项式-3x4a-by2与是同类项,那么这两个单项式的积是()。
A.x6y4
B.-x3y2
C.
D.-x6y4
参考答案:D
解析:
依题意,得
,故正确答案为D。
急腹症手术麻醉正确的是
A.如采用全麻应酌情选用对循环影响小的药物如芬太尼
B.尿量维持在30ml/小时以上,
C.呼吸循环功能稳定的患者可选用硬膜外麻醉
D.麻醉维持多采用复合麻醉
E.保持血压在80mmHg以上
根据下列程序的执行结果,可以断定划线部分的修饰符应为 【14】 。执行结果:i9a football is created.a football is created.i=10a football is destroyed.a football is created.i=20a football is destroyed.a football is destroyed.源程序:# inelude<iostream. h>class Footballpublic: Football() cout<<"a football is created. "<<end1; ~Football() cout<<"a football is destroyed. "<<end1;;void func(int i) ______ Football f1; Football f2; cout<<"i= "<<i<<end1;void main() func(10); func(20);