日食或月食的形成是因为光在______介质中是沿直线传播的.
日食、月食是光沿直线传播形成的.
故答案为:同种均匀.
句型转换。
1. Sometimes Dick and Jack go to work by car. (同义句转换)
Sometimes Dick and Jack ______ ______ work.
2. Excuse me, how can I get to the bank? (同义句转换)
Excuse me, could you tell me ______ ______ get to the bank?
3. How many workers are there in your factory? (同义句转换)
How many workers ______ your factory ______?
4. Paul usually goes to the library once a week. (对画线部分提问)
______ ______ does Paul usually go to the library?
5. Please open the door. (改为否定句)
______ ______ the door, please.
关于音像制作单位的说法,与国家规定不符的是()。
A.音像制作单位接受委托制作音像制品,应当与委托的出版单位订立制作委托合同
B.音像制作单位应验证出版单位"音像制品出版许可证"
C.音像制作单位应验证由出版单位盖章的音像制品制作委托书
D.音像制作单位可以少量销售本单位制作的音像制品