鼻咽纤维血管瘤的主要临床表现是什么?

患者女，68岁，全牙列缺失，拟行全口义齿修复，全口义齿排牙完成后需要口内试戴，除要求有良好的咬合关系和平衡外，对义齿基托蜡型也有严格要求。

若全口义齿蜡型试戴时固位力差，下列哪一项与蜡型无关（）。

A.型

B.基托组织面与口腔黏膜不密合

C.边缘伸展过多

D.磨光面外形差

E.唇颊舌系带没让开

下列各组物质投入水中．搅拌后可能得到无色、澄清溶液的是

A．NaOH、KCl、H₂SO₄

B．KNO₃、 HCl、 CuCl₂

C．Na₂CO₃、NaNO₃、Ca(OH)₂

D．Ba(OH)₂、MgCl₂、FeCl₃

下面的程序是利用公式求π的近似值，直到最后一项的值小于10^-7为止；最后输出π的近似值。请根据题义编写计算π的函数。

#include＜stdio.h＞

#include＜math.h＞

double fpi()；

main()

double pi，n；

printf("请输入计算精度")；

scanf("%lf"，&n)；

pi=fpi(n)；

printf("π=%f\n"，pi)；

/*以下为定义函数部分*/

The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The (91) of passing through each network is the same; it is one (92) count. So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts. Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required. A (93) through a network can have different costs (metrics). For example, if maximum (94) is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum (95) is the desired type of service, a fiber-optic line has a lower metric than a satellite line. OSPF allow each router to have several routing table based on the required type of service.

（93）是（）

A.flow

B.window

C.route

D.cost

在气焊和气割的操作中，使氢气或乙炔气体在氧气里燃烧，能产生高达3000℃以上的氢氧焰或氧炔焰，用来焊接或切割金属。