| {{B}}
Escaping from the Earth{{/B}} The Earth has a force that pulls things toward itself. We call this force gravity(地心引力). This is something we live with all the time, and we take it for granted and hardly ever think about it. But it is a most important factor in rocket operation and must be overcome if we are to get anywhere in space, or off the ground at all. Take the throwing of a ball as an example. The harder the ball is thrown, the faster and higher it will go. What is the secret Its speed. If we could throw the ball hard enough it would go up and up forever and never come down. The speed at which it would have to be thrown to do this is known as escape speed. Of course, we cannot throw a ball hard enough beca A. Few spacecrafts complete their flight operations. B. The Earth’s gravity cannot be overcome. C. No future power is needed after the escape speed is reached. D. "Free fall" takes the place of the Earth’s gravity pull. [单选题]根据民事权利的分类，下列权利中，属于形成权的是（ ）。
A.合同当事人请求对方履行合同义务 B.受害人请求致害人赔偿损失 C.继承人放弃继承权 D.合同当事人请求违约方支付违约金 [单选题]《煤矿安全规程》规定：在坚硬和稳定的煤、岩层中，确定巷道不设支护时，必须制定( )措施。
A.过渡 B.安全 C.技术 [单选题]
安全的组织管理是指( )。 A. 制定有效的安全管理政策 B. 设立安全管理的机构 C. 设计并建立一种责任和权力机制以形成安全的工作环境的过程 D. 把安全管理作为组织目标的一部分 [简答题]如何礼貌结束电话？
[单选题]前牙Ⅱ°深覆盖的分度，正确的是
A.0～3mm B.3～5mm C.5～8mm D.8～12mm E.12mm [单项选择]1988年的《巴塞尔报告》规定，银行的核心资本与风险加权资本的比率不得低于( )。
A. 5% B. 4% C. 6% D. 8% [判断题]温升可能会导致磁材料导磁性能变坏。
A.正确 B.错误 [简答题]计量检定的依据是什么？计量检定规程有哪几种？各自适合什么范围？
[多选题]下列哪些标准应用了以过程为基础的质量管理体系模式的结构( )。
A.ISO9000:2000《质量管理体系基础和术语》 B.ISO9001:2000《质量管理体系要求》 C.ISO9004:2000《质量管理体系业绩改进指南》 D.ISO19011:2000《质量和环境管理体系审核指南》 我来回答: 提交
|
