题目内容
如果桁架上弦杆最大受力节间的轴向力及局部弯矩设计值分别为N=1150kN，Mx=165kN.m。上弦杆选用轧制H型钢HM482×300×11×15，截面特性Wx=2520×103mm3，A=146.4×102mm2。考虑露天的腐蚀性环境影响，杆截面抵抗矩及截面积的净截面折减系数取0.9。试问，对上弦杆作强度验算时，其截面上最大拉应力设计值(N/mm2)应与下列何项数值最为接近？
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The sum of the lengths of two sides of isosceles triangle K is 7. K has a side of length 4.
Column A Column B
The perimeter of K 11
Task 2
Directions: This task is the same as Task 1. The 5 questions or unfinished statements are numbered 41 through 45.
In China phone talk is expensive. If you want to make it cheaper, make phone calls using the Internet, which can cost as little as 30% or even 5% of a traditional call.
But changing your DDD (domestic direct dial) and your IDD (international direct dial) calls for the net version, called voice over the internet protocol (互联网协议) or VoIP, requires you to choose between different types of technology, with different advantages.
If a telephone connection was a road, a regular phone call allows you and the person you are calling to share the road without anyone else. On this empty road, the connection is fast, efficient, and uninterrupted. But with VoIP technology, your voice is broken into millions of separated packets of information that share the road with all the billions of other bits of information on the Internet. When the packets reach the person you are calling, they are gathered to resemble your voice. Depending on which type of VoIP you are using, the speed of the Internet connection, Internet traffic, and the service provider, the resulting voice quality can vary -- from quite good to quite awful.
The three main ways of using the internet to make calls are PC-to-PC (家用电脑) calls, PC-to-Phone calls and China's popular IP phone card.
VoIP calls are cheapest when they are made between two computers or between a PC and a telephone. For both, make sure you have a computer, an internet connection, a sound card, and most importantly, a headset (套头耳机) with a microphone.
People prefer IP phone calls to ordinary ones because the former is ______.
Which of the following statements is NOT true？
甲公司2004年11月1日购入乙公司股票5万股，购买价每股6元，占甲公司短期投资总额的12%；2004年12月31日该股票的市价为7元；2005年3月20日分派现金股利，每股0.10元；2005年4月2日出售该股票20万股，每股售价8元。如果不考虑其他因素的影响，该股票的出售损益为()元(假设出售该短期投资的同时结转已计提的跌价准备)。
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