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【单选题】
以下标识符不是关键字的是A.
break
B.
char
C.
Switch
D.
return
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反馈参考答案：
举一反三
【简答题】阅读理解。 Ann loves the underground (地铁) in London. She always prefers to travel on the underground because it is fast. She doesn't find it difficult now, as she has got used to (逐渐习惯) it. Ann knows the u...
【多选题】杠杆原理的应用很多，有省力杠杆，有费力杠杆。与负载相比，作用力的力臂较大的，就是省力杠杆。下列属于省力杠杆的是
A.
给我一个支点，我可以撬起整个地球
B.
林丹抖腕击球
C.
踮脚尖，即脚后跟提起
D.
手托起一个铅球，手腕与肘水平
E.
转动钥匙开门
【单选题】Traveling around big cities by taxi can cost a lot of money, but it's usually to take the underground train to most places.
A.
amazing
B.
expensive
C.
convenient
D.
exciting
【单选题】轴上零件轴向固定目的是为了保证零件在轴上确定的轴向位置、防止零件轴向移动、下面哪种固定方式不是轴上零件的轴向固定方法( )
A.
套筒
B.
圆锥面
C.
弹簧垫圈
D.
平键联接
【简答题】New Ideas Iceland's President Olafur Grimsson is trying to drive carbon dioxide underground to 51 its release into the air. Over the next two years, a team of scientists will try to 52 carbon dioxide-...
【简答题】简述保险合同中止和终止的区别。
【简答题】27 Air pollution can be as harmful to one's health___________ 28 Traveling on an underground train can reduce exposure___________ 29 Pollution levels are lower__________ 30 It's wise to stay away from...
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