流出直流电路任一节点的电流等于从该节点流出的电流。（）
A. 对
B. 错
There are five short dialogues about China. Listen carefully, and choose the best answer to the question.[音频]Q: What has changed for China according to the dialogue?
A. It has new trading partners.
B. It has become a world power.
C. It has no world status.
D. It has become a regional power.
Q: Why does China have the attention of NASA?
A. It has landed on the dark side of the Moon.
B. It has landed on Mars.
C. It has a space station on the Moon.
D. It has landed on the Venus.
Q: What is China not a part of?
A. The United Nations.
B. The World Health Organization.
C. The G-7.
D. The G-20.
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