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【单选题】
在生产中，由于机械转动、气体排放、工件撞击与摩擦所产生的噪声，称为生产性噪声。生产性噪声一般可分为机械性噪声、空气动力噪声和电磁性噪声三类。下列设备产生的噪声中，属于空气动力噪声的是( )。A.
球磨机
B.
汽轮机
C.
冲压床
D.
砂轮机
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【单选题】开放参不美观勾当正确的操作挨次是（）。
A.
筹备宜传小册子、组织不美观摩勾当、半途歇息处事、赠予纪念品、搜聚定见
B.
筹备宣传小册子、组织不美观摩勾当、赠予纪念品、半途歇息处事、搜聚定见
C.
筹备宣传小册子、赠予纪念品、组织不美观摩勾当、半途歇息处事、搜聚定见
D.
筹备宣传小册子、搜聚定见、组织不美观摩勾当、赠予纪念品、半途歇息处事
【单选题】Why does the author cite the sea somewhere near Japan?
A.
To show that the sea in some places is very deep.
B.
To show that the sea in some places is very shallow.
C.
To show that its depth is 9 kilometers greater than the height of the highest mountain.
D.
To show that its depth is 11 kilometers greater than the height of the highest mountain.
【单选题】— Oh, they’ve had an accident. — When ?
A.
it happened
B.
did it happened
C.
did it happen
D.
has it happen
【单选题】— Oh, they’ve had an accident. — When ?
A.
it happened
B.
did it happen
C.
has it happen
【单选题】The details of the private investigation show that the firm
A.
was interested in his family background.
B.
intended to check out his other job offers.
C.
wanted to know something about his preference.
D.
was interested in any personal detail of the man.
【简答题】What found below the waters could show that the cities were once the destinations for religious pilgrims?
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