建立内节点方程时，显式差分格式的稳定性判据的条件是（ ）？ A: Fo＜=1/4 B: Fo＞=1/4 C: Bi＞=1/4 D: Bi＜=1/4

常物性、无内热源的一维非稳态导热，控制其数值解的稳定性条件为（ ）？ A: Fo≤1/4 B: Fo≥1/4 C: Fo≤1/2 D: 条件不足，不能确定

常物性、无内热源的一维非稳态导热，控制其数值解的稳定性条件为（）？ A: Fo≤1/4 B: 条件不足，不能确定 C: Fo≤1/2 D: Fo≥1/4

PCM30/32系统传输复帧同步码的位置为 ( ) A: Fo帧TS16前4位码 B: Fo帧TS16后4位码 C: F1帧TS16前4位码 D: F1帧TS16后4位码

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

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")