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【简答题】
按系统与环境之间物质及能量的传递情况，系统可分为 封闭系统、 开放系统、隔离系统。蒸馏实验的装置系统属于上述三种中的 系统 。
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举一反三
【简答题】在计算机的外部设备中,除外存储器:软盘、硬盘、光盘和磁带机等外,最常用的输入设备是键盘、____。
【简答题】I’ve never been to New York. I, ______ , don ’t know much about the city. A.however B.therefore C.otherwise D.perhaps
【单选题】--- ______? --- I’ve never been there but I hope to go there in the future.
A.
Have you been to America
B.
Where are you going for holiday
C.
What did you do last week
【简答题】I've never been to Beijing, but it's the place __?I've never been to Beijing, but it's the place _______. A) where I'd like to visit B) in which I'd like to visit C) I most want to visit ...
【单选题】听力原文： It is believed that the hot dog was born in Germany. Its creator, a German butcher named Johann Georg Lahner developed its prototype first in Frankfurt, a German city, hence frankfurter as its n...
A.
The name of a dog.
B.
The name of a flavoring (调味品).
C.
The name of a person.
D.
A way of cooking.
【单选题】Many housewives prefer to buy meat in the supermarket rather than at for the sake of safety.
A.
butcher’s
B.
the butcher
C.
the butche r ’s
D.
the butchers’
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