用集总参数法求解非稳态导热问题的前提条件是（ ）。 A: Bi>0.1 B: Bi≤0.1 C: Fo>0.2 D: Fo≤0.2

[*]对非稳态导热问题显式差分格式离散方程组求解，计算的稳定条件是 A: Fo>1/2 B: Fo≤1/2 C: Fo<1/4 D: 无条件稳定

The Chinese people love peace, __________ peace and are ready to fight for peace. A: ask fo B: long fo C: seek fo D: take fo

Juliet is new at this job, but her enthusiasm can make up for her lack of skill. A: call fo B: un fo C: opt fo D: compensate fo

Jack has been out of work for a long time,so he wants to _____ a job in this factory. A: care fo B: apply fo C: wait fo D: prepare fo

正规热状况阶段就是当非稳态导热进行到一定深度(τ>τ’或者Fo>0.2)后，初始条件的影响基本消失，温度分布取决于边界条件的影响，这时可以取完整分析解的第一项进行计算。 A: 正确 B: 错误

LC组成一个串联谐振回路，谐振频率为fo，把它接在串联回路中，最易通过的信号频率是 A: fo B: 大于fo C: 小于fo D: 不为fo

_________ the clouds, you would find the airplane in the sky easily. A: Had it not been fo B: If it were not C: If it had not been fo D: Were it not fo

以下文件操作方法,打开后能读取CSV格式文件的选项是:() A: fo = open("123.csv","a") B: fo = open("123.csv","w") C: fo = open("123.csv","x") D: fo = open("123.csv","r")

以下文件操作方法，打开后能读取 CSV 格式文件的选项是：‪‬‪‬‪‬‪‬‪‬‮‬‪‬‫‬‪‬‪‬‪‬‪‬‪‬‮‬‫‬‭‬‪‬‪‬‪‬‪‬‪‬‮‬‪‬‮‬‪‬‪‬‪‬‪‬‪‬‮‬‪‬‭‬‪‬‪‬‪‬‪‬‪‬‮‬‪‬‭‬‪‬‪‬‪‬‪‬‪‬‮‬‪‬‪‬ A: fo = open(123.csv,w) B: fo = open(123.csv,x) C: fo = open(123.csv,r) D: fo = open(123.csv,a)