关于点光源的说法正确的是（ ） A．夜间我们看到的恒星都可以看作点光源 B．发光

单词拼写。根据下列句子及所给汉语注释，在相应题号的横线上写出空缺处各单词的正确形式。

（每空只写一词）

1. Several famous ______ (女演员) were invited to the party last night.

2. Take some ______ (备用的) clothes with you when leaving in case you get cold.

3. I can't find a copy of the dictionary you ______ (提及) to yesterday.

4. They got lost in the desert and ______ (挨饿) to yesterday.

5. As more people arrived, the room got much ______ (嘈杂).

6. In ______ (历史) lessons, we learn a lot about foreign countries and people.

7. Up to now, many girls in the poor mountain villages are ______ (禁止) to go to school.

8. ______ (整个) the summer and autumn he stayed inside his house.

9. The ______ (温暖) of the fire made us comfortable and sleepy.

10. With more ______ (烟囱) pulled down, the air is getting cleaner and cleaner.

在连续交易系统中，并非意味着交易一定是连续的，而是指在营业时间里订单匹配可以连续不断地进行。（）

频谱

- Parken ist hier verboten. - Ja, ich wei . Hier __________ man nicht parken.

请解释VDPV病例含义？