柴油机汽缸套在工作过程中温度变化剧烈,燃烧过程中燃气温度最高可达()。
A.2000℃
B.200℃
C.20000℃
D.100℃
参考答案:A
读72006530时,一个零都不读。[ ]
—Mum, I’m hungry. ______ no milk in the fridge.
—Oh, I’ll go and buy some at once.[ ]
A.There is
B.It is
C.There are