试题与答案

2010年12月25日,我国的“远望六号”测量船完成“嫦娥二号”卫星等海上测控任

题型:计算题

题目:

2010年12月25日,我国的“远望六号”测量船完成“嫦娥二号”卫星等海上测控任务平安回到祖国,如图所示。“远望六号”测量船满载时排开水的质量为26000t,它采用当今航天、航海气象、通信等领域最新技术,“远望号”是中国航天活动的护航使者。(g=10N/kg,海水的密度取1.0×103kg/m3,光速为3.0×108m/s)问:

(1)满载时,“远望六号”受到的浮力有多大?

(2)若船底某处的声纳系统探测头距海面的深度为7.5m,则该处受到海水的压强是多少?

(3)在航天测量时,通过船载雷达发现了目标。若雷达发出电磁波经2.×10-3s收到了回波,则目标距“远望六号”的距离是多少?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:当细菌受到某些理化因素或药物作用时,其细胞壁被直接破坏或合成受到抑制,但这种细胞壁缺陷型细菌仍能够生长、繁殖和分裂,称之为L型细菌。因此,细胞壁缺损或没有细胞壁的多形细菌称为L型细菌。

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