f a kind of liquid is used to cool the diesel engine, it is invariably called _____.
A. lubricant
B. coolant
C. combustion product
D. second refrigerant
Dirty oil must () before being used again.
A. wash
B. be mixed
C. be purified
马立克氏病的病原属于()
A. 正黏病毒
B. 副黏病毒
C. 疱疼病毒
D. 反转录病毒
E. 腺病毒
世说新语》对后代的()文学颇有影响。()。
A. 游记
B. 笔记
C. 传记
D. 书信体