全封闭压缩机与开启式压缩机相比,对冷冻机油的()要求更高。
A.电绝缘性
B.氧化安定性
C.含水量
D.粘度指数
参考答案:A
列入经国家院批准设立的特殊区域的范围包括 ( )
A.保税区
B.出口加工区
C.边境经济技术合作、自由贸易、特别管理区域
D.经济特区
Dear Ming,
It was very nice to hear from you for such a long time.I’m 1.
glad to learn that you’ve been settled down in Boston and are 2.
getting used to the local ways of life. 3.
As you know,I’still buried in books at school you are 4.
so familiar with.What may surprise you are that I’m going to 5.
the US this July in a summer camp!Surely I’m expecting lots 6.
of sightseeing tours,parties and another exciting things.We must 7.
definitely meet when I’m over.As is planning,I’m coming 8.
to Boston around the 15th,and I wonder if you’ll free then so 9.
we could chat about the good older days. 10.
Hope to see you soon.
Yours,
Xiao Lei