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【单选题】
作已知直线的连接圆弧,半径为R时,可以通过( )来确定圆心。A.
作已知直线的平行线，平移距离为R
B.
以已知圆弧的圆心为圆心，半径之差为半径作圆弧
C.
任意点
D.
以已知圆弧的圆心为圆心，半径之和为半径作圆弧
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皮皮学刷刷变学霸
举一反三
【单选题】在色散型红外分光光度计中,样品是放在 ________ 和 ________之间进行测定。
A.
光源和单色器
B.
光源和检测器
C.
单色器和检测器
D.
检测器和数据处理器
【简答题】请将东京比京都热闹翻译成日语。
【单选题】— do you fly to Japan to see your son? —Once a year. [ ]
A.
How long
B.
When
C.
How many
D.
How often
【单选题】— do you go to see a film? —Twice a month. [ ]
A.
How far
B.
How soon
C.
How long
D.
How often
【单选题】—_______ do you go to see your grandparents? —Once a week. [ ]
A.
How long
B.
How often
C.
How many
【单选题】— _____ do you see your grandparents? — Once a month. [ ]
A.
How long
B.
How soon
C.
How much
D.
How often
【单选题】If a davit-launched life raft aboard a vessel cannot be launched because of damage to the davit, you should ______.
A.
inflate the life raft on deck
B.
roll the life raft over the side
C.
go to another life raft station
D.
get a saw and cut the life raft free
【单选题】Whatkind of luggage does the guest have?
A.
Theguest has a small blue suitcase.
B.
Theguest has a big black suitcase.
C.
Theguest has a roll aboard and a suitcase.
D.
Theguest has two suitcases altogether.
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