人工饲料
参考答案:
是根据蚕桑的食性特点和营养要求,采用适当的材料,经人工配制而成,以代替藏掖作为桑蚕的饲料。
Read and judge. 快乐英语阅读吧!判断下列句子是(T)否(F)与短文内容一致。
It's two in the afternoon. Danny is sleeping now. Tomorrow is Sunday. I will go to the park. I will look at
the beautiful flowers. I will pick some flowers for my mother. After that I will jump and run. I will run very
fast. I will run faster than the police officer. Oh, no! Don't catch me. Help! Help! I will not do that again.
Suddenly Danny wakes up.
( )1. Danny has a dream.
( )2. Danny goes to the park.
( )3. Danny picked some flowers in the park.
( )4. Danny was caught by the police officer.
( )5. Today is Saturday.
钻深孔时,为提高效率应选较大的切削速度。