预防疾病最有效的措施是（）A、针对致病因素所采取的预防措施 B、改善环境措施 C、增进人

一个三位数，十位上的数字是百位上数字的2倍，个位上的数字比百位上的数字大4，三个数位上的数字和是12．这个三位数是多少？

下列关于谨慎性原则运用正确的是( )。

A．计提秘密准备金

B．高估资产或收益

C．对可能发生的各项资产损失，按规定计提资产减值准备

D．少计负债或费用

句型转换。

1. I think it will rain. (否定句)

    I _______ think it _______ rain.

2. Can you tell me how to get to the park, please? (同义句)

    Can you tell me ______________________ the park, please?

3. Tom uses a knife to open the tin. (同义句)

    Tom _______ the tin _______ a knife.

4. These fish are sleeping. Their eyes are open.(同义句)

    These fish are sleeping ________ their eyes _______.

5. He turned around but could not see anything unusual. (同义句)

    He turned around but could see __________________________.

称重传感器的供桥电压是否越大，输出灵敏度就越大？