5 feet
10 feet
15 feet
20 feet
what chemicals did you use to treat the boiler water ?when you test alkalinity and acidity of water in boiler by pH test paper ? the result shows the boiler water is in acidiity . please describe what the possible cause is .
点击查看答案
What percentage of your college did you college did you pay for and what sort of jobs did you have while you were in school?
28． What did people usually do before when they had usedup their films?A． They often bought a new camera．B． They often bought some new films．C． They often showed them to their friends．D． They returned their cameras to the factory．
30． Which is the best title for the passage?A． How to use a camera ．B．The history of the cameraC． Who is George Eastman?D． The new uses of the camera
What does the writer mean by “it would be worth half what I paid for it ”(paragraph2)A. He should get a 50% discount.B. The price of the camera was unreasonably high.C. The quality of the camera was not good.D. The camera would soon fall in value.
Which of the following questions can be used in the questionnaire for assessing participation?A.Did you get all the questions right in today's class B.Did you finish the task on time C.Can you use the strategies we have learned today D.What did you do in your group work today
Which of the following questions can be used in the questionnaire for assessing participation?A.Did you get all the questions right in today’s class? B.Did you finish the task on time? C.Can you use the strategies we have learned today?? D.What did you do in your group work today?
