Unless we spend money to spot and
prevent asteroids(小行星) now, one might crash into Earth and destroy life as we
know it, say some scientists. Asteroids are bigger versions of the meteoroids(流星) that reace across the night sky. Most orbit the sun far from Earth and don’t threaten us. But there are also thousands of asteroids whose orbits put them on a collision course with Earth. Buy $ 50 million worth of now telescopes right now. Then spend $ 10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we’ll have a way to change its course. Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn’t be cheap. Is it worth it Two things exp A. while pushing asteroids off course nuclear weapons would destroy the world B. asteroids racing across the night sky are likely to hilt Earth in the near future C. the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime D. workable solutions still have to be found to prevent a collision of asteroids with Earth [单项选择]不常用管道组成件是()。
A. 三通 B. 弯头 C. 异径管 D. 回弯头 [判断题]土由塑性体状态向半固体状态过渡的界限含水率称为塑限。
[填空题]二倍体生物:2n=2X,n=()水稻2n=2X=24,n=X=12;蚕豆2n=2X=12,n=X=6;亚洲棉2n=2X=26,n=X=13;大麦2n=2X=14,X=7。
[单项选择]关于CT血管造影(CTA)的描述,错误的是
A. 是通过外周动脉内注射对比剂扫描后,采用三维成像诊断血管性疾病的方法 B. 属于无创或微创检查 C. 在一定范围内可替代常规血管造影 D. 与常规X线血管造影相比,CTA的诊断准确率较高 E. 与常规X线血管造影相比,CTA的时间分辨力仍不如常规X线血管造影 [判断题]木工机械作业中,周围木料应码放整齐,保持操作通行的空间。
A.正确 B.错误 [判断题]( )230,AG004全面质量管理中的QC小组是员工自发性的组织,其小组活动没有明确的目的性。
A.正确 B.错误 [单选题]19.下列哪一项属于难复性腹外疝
A..疝内容物回纳时疼痛 B..疝内容物与疝囊粘连 C..疝内容物回纳时迅速 D..疝内容物回纳时缓慢 E..疝内容物有血运障碍 [单选题]油浸式电力变压器必须布置在民用建筑物中时,其总容量不应大于( ),单台容量不应大于( )。( )
A.1260kVA 630kVA B.2000kVA 1000kVA C.1600kVA 800kVA D. 2500kVA 1250kVA [单选题] 电缆径路图中:196-48(6)的表中,196表示()。
A. 电缆长度 B. 电缆总芯数 C. 备用芯线数 D. 电缆编号 [多选题]安全工器具包括防止触电、灼伤、坠落、淹溺等事故或职业危害,保障作业人员人身安全的()和标志牌等专用工具和器具的管理,应符合《国家电网公司安全工器具管理规定》。
A.个体防护装备 B.绝缘安全工器具 C.登高工器具 D.安全围栏(网) [单项选择]第六组:
患者,男,30岁,30分钟前被刀刺伤右前胸部,咳血痰,呼吸困难。体检:血压107/78mmHg,脉搏96次/分,右前胸有轻度皮下气肿,右锁中线 4肋间可见3cm长创口,随呼吸有气体进出伤口响声。 在观察过程中,患者胸闷进行性加重,拍片提示右侧大量积气,最有可能的诊断是 A. 张力性气胸 B. 血胸 C. 连枷胸 D. 心绞痛 E. 心肌梗塞 [判断题]当其他因素一定的时候,贴现率越高,客户的终生价值就越小。
[判断题]判断题 La5B1010
620340客户接待人员与客户会话时,必须讲普通话。() A.正确 B.错误 [单选题]以下化学品属于氯化剂的是()。
A.次氯酸 B.氯化钙 C.氯化钠 [单项选择] {{B}}Section One{{/B}} Directions: There are three passages in this section. Each passage is followed by some questions or unfinished statements. For each of them, there are four choices marked A, B, C and D.
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