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【单选题】
关于超级计算机，下列说法不正确的是：（）
A.
我国是继美国之后第二大高性能计算机研制生产国
B.
我国的“天和二号”是目前世界上运算速度最快的计算机
C.
现有的超级计算机运算速度大都可以达到每秒一兆（万亿）次以上
D.
超级计算机的主要特点表现为高速度和大容量，配有多种外部和外围设备及丰富的软件系统
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