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【简答题】
马蹄形机是由( )自主研发的新型机,因其开挖断面呈"U"形得名。( )年,世界首创的"马蹄形"机在开下线。马蹄形机的诞生是中国铁路隧道施工技术与装备发展史的里程碑事件,标志着世界异型隧道掘进机研制技术迈向新阶段,实现异型装备的自主化和智能化。 2 、 ( )年,C919大型客机在上海浦东机场圆满首飞。首飞时,C919最大飞行高度3000米,飞行速度最高170节。
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皮皮学刷刷变学霸
举一反三
【单选题】When a tax is placed on a good
A.
the price paid by buyers rises, and the price received by sellers rises.
B.
the price paid by buyers rises, and the price received by sellers falls.
C.
the price paid by buyers falls, and the price received by sellers rises.
D.
the price paid by buyers falls, and the price received by sellers falls.
【单选题】FreeRTOS 中任务( Task )可能处于:运行态、阻塞态、就绪态、挂起态四种之一,不同状态之间可以进行转换,但以下不可能直接实现的转换是:( )
A.
由就绪态到运行态
B.
由阻塞态到挂起态
C.
由就绪态到挂起态
D.
由挂起态到阻塞态
【单选题】当一条船经过的时候,他们本来可以得救,但为什么作为求救信号的火熄灭了 ?
A.
负责看火的杰克去打野猪了
B.
负责看火的西蒙独自进到了小林子里
C.
小家伙们内部发生了冲突，没人照料火
D.
没有对看护火把的任务进行明确分工
【单选题】When a tax is placed on the buyers of a product, the
A.
size of the market decreases.
B.
effective price received by sellers decreases, and the price paid by buyers increases.
C.
demand for the product decreases.
D.
All of the above are correct.
【简答题】把下列句子变成被动词态。 1. Do they teach Japanese in their school? ______________________________________________________ 2. We heard her sing in the room. ______________________________________________________ ...
【单选题】When a tax is placed on the sellers of a product it will shift the
A.
supply curve down.
B.
supply curve up.
C.
demand curve up.
D.
demand curve down.
【简答题】在偶校验法中，无论信息位多少，监督位只有1位，它使码组中“1”的数目为（）。
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