在图10-9所示电路中,已知:U=10V,I1=-4A,I2=1A。电流I3为()A。
A.1
B.2
C.3
D.不能确定
参考答案:C
用括号内单词的适当形式填空。
1. The old should be spoken to _____(polite).
2. My family lives in the _____(center) park of the city.
3. He is too _____(care)to pass the final exam.
4. Poetry is a beautiful way to express _____(think) and feelings.
5. Children's _____(expect) ideas often surprise the adults.
6. Our neighbor are always _____(friend)to us.
7. You can find the Capital Stadium on the map _____(easy).
8. Today is Tony's _____(nine) birthday. Let's go to celebrate it.
9.A lot of _____(tour) love going to Beijing for their holidays.
10. My favorite football team was _____(beat) in the Cup Final.
高压的绝缘子、高压隔离开关、跌落式熔断器还要做交流工频耐压试验,试验数据和时间按国家标准《电气装置安装工程电气设备交接试验标准》(GB 50150—2006)执行。( )