需要后下的一组药物是（） A．降香、薄荷、鱼腥草  B．西洋参、羚羊角、水牛角  C

阅读短文，判断正(T)误(F)。

     It was Sunday yesterday. The weather was fine. Jim and Tom went to the zoo by bike. They saw lots

of animals there. They were very happy.  At eleven o'clock, they were hungry and thirsty. So they bought

some hot dogs and some milk. They had them for lunch. Then they played in the zoo. They jumped and

ran. They had a good time.

( ) 1. The weather was fine yesterday.

( ) 2. They went to the park by bike.

( ) 3. They saw lots of animals.

( ) 4. They had some bread and milk for lunch.

( ) 5. They had a good time.

在横线里填上适当的质数：

30=______+______=______+______=______+______+______．

设

(n=0，1，2，…，0≤x≤1)。

证明

星协

电缆的三防是指什么？