饲料是指经工业化加工、制作的供动物食用的饲料,包括单一饲料、添加剂预混料、浓缩饲料、配合饲料和精料补充料。
参考答案:对
根据句意用适当的人称代词填空。
1. This is Linda. _____ is my friend.
2. This is my daughter. _____ is ten
3. —What's this?
—_____ is a pen.
4. This is John. _____is my brother.
5. —Are those your friends?
—Yes, _____ are.
6. —Are _____eleven years old?
—No, I'm ten.
7. —Are you and Tom good friends?
以下哪些条件属于低瓦斯矿井。()
A.绝对瓦斯涌出量≤40m3/min
B.相对瓦斯涌出量<10m3/t
C.相对瓦斯涌出量≤10m3/t
D.绝对瓦斯涌出量<40m3/min