将10W、100Ω和15W、1kΩ的两个电阻串联起来,所允许流过的最大电流为()。
A.0.31A
B.0.43A
C.0.12A
D.0.19A
参考答案:C
阅读短文,并选择正确选项。
I am Jack. I am very happy every holiday. I usually go to the library. Sometimes I go to the park. The
library is not far. I usually go on foot. I walk straight for fifteen minutes. Then I turn left, the library is on the
right. The park is very far. It's near the post office. I often get there by the No. 206 bus, get off at the post
office. It's easy to find it.
1. I have a good time every _____________.
A. holiday
B. weekend
2. I usually go to the _____________ on foot.
A. park
B. library
3.The library is on _____________.
A. the left
B. the right
4. I go to the _____________ by bus.
B. supermarket
5. The park is near _____________.
A. post office
Samples of blood from Cholera infected patients have been sent to the blood center _______. [ ]
A. to be checked
B. to be examined
C. to test
D. being tested