下图所示的各电场中，A、B两点场强相同的是（） A． B． C． D．_爱下问搜题

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问题选择题

下图所示的各电场中，A、B两点场强相同的是（）

A．

B．

C．

D．

答案

答案：C

完形填空

It was during those hard days in a small community． Food was in short supply． I used to stop by Mr．Miller's stand for
One particular day, while Mr．Miller was        some potatoes for me I noticed a small boy      admiring a basket of green peas． Soon I was also       to the fresh green peas．
The boy left． Mrs．Miller _     to me and said, "There are two other such boys in our     _, all from poor families． Jim always offers to     our produce for their marbles（弹珠）． He somehow makes them believe he likes red marbles      ．Sometimes he even sends them home with some peas for     ．" I left the stand,       with this man．
Years later, I went back to visit some       in that community and while I was there I learned Mr．Miller had died． I agreed to       my friends to see Mrs．Miller． Upon our arrival, we offered whatever words of       ． Ahead of us were three young men． They moved to the casket（棺椁）． Mrs．Miller's eyes followed them       each young man placed his own      hand over the cold pale hand and then left．
Our turn came to meet Mrs．Miller．I told her who I was and mentioned the     of the marbles． She said, "Those three young men were the boys． They told me how they      Jim's kindness．"
"We've never had much     ," she said, "but right now, Jim would consider himself the       man．" Then she lifted her husband's lifeless fingers．     beneath the hand were three shining, red marbles !

B．in particular

C．disappointed

C．businessmen

D．encouragement

A．appreciated

单项选择题

实际作业时，测记开始沉降时间，加上操作时间表中预定粒径（级）的操作时间即为大于或小于该粒径（级）得收集时间，（）收集时间，实时收集泥沙样品。

A、未到

B、快到

C、到达

D、过了