问题
选择题
They had to ______ the 800-meter race because of the bad weather . [ ]
A. put on
B. put off
C. get on
D. get up
答案
答案：B
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They had to ______ the 800-meter race because of the bad weather . [ ]
A. put on
B. put off
C. get on
D. get up
答案：B
如下图所示是“研究电流与电压的关系”的实验电路图。当某同学按电路图连接好实物开始实习电压表和电流表出现如图所示情形
为：① ：②
(3)下面是排除故障后进行实验时的数据记录：
| 实验次序 | 1 | 2 | 3 |
| 电压U(伏) | 3．2 | 4．8 | 6．4 |
| 电流I(安) | 0．5 | 0．75 | 1．00 |