正常生产时，炉内的分压比PH20/PH2保持在（）左右。
A.0.1
B.0.2
C.0.3
D.0.4
参考答案：B
I have no idea____________ the book is __________ to your English study.
A．whether, of great value
B．if , of great value
C．that , so value
D．how , very valuable
应当在输入检疫物的合同或者协议中订明必须附有输出国家或者地区政府动植物检疫机关出具的检疫证书。( )
