【简答题】When we had our class, our psychology teacher would take any liquid medicine from a tiny bottle. This touched the whole classes. We thought that he should ask for leave and stayed at home for a rest, ...
【简答题】B We once had a poster competition in our fifth grade art class. “You could win prizes,’’our teacher told US as she wrote the poster information on the blackboard. She passed out sheets of constructio...
【单选题】How is an artificial fog made in the movies?
A.
By passing steam over dry ice.
B.
By turning ordinary ice into steam.
D.
By mixing dry ice with ordinary ice.
【单选题】By the time my mom _____ to our school, all others of my class ______ for home.
【单选题】Why does the author mention refrigeration in paragraph 6?
A.
To show how the steam engine contributed to refrigeration
B.
To illustrate the standard of living of North America and Europe
C.
To give an example of an innovation that expanded markets
D.
To argue that refrigeration was the most important invention of the time
【简答题】发光二极管简称 ,经常使用的发光二极管管脚引线较长者为 ,引线较短的为 。
【单选题】If a boiler is isolated from the steam-using system, how must it be kept?
A.
ln closed dry storage.
B.
Completely full of treated water.
C.
Under a low steam pressure
【简答题】We once had a poster competition in our fifth grade art class. “You could win prizes,” our teacher told us as she wrote the poster information on the blackboard. She passed out sheets of construction ...