| A single rocket is not powerful enough
to send a spaceship into space. This is because all the fuel a single rocket
can. carry is not enough to give the necessary amount of power. To get enough
fuel and power to last till the spaceship gets out of the Earth’s gravitation
force (引力) , a number of rockets are needed. These rockets are connected one on
top of the other, looking much like a large tower. Together they form a
multi-stage rocket. The spaceship lies at the top of the multi-stage
rocket. The first stage of a multi-stage rocket is called the booster. It is the biggest as it has to lift the whole thing from the ground. The booster helps to lift the rockets into the sky. When the fuel of the booster is used up, it separates from the rest of the rocket and drops to the Earth. When this happens, the second stage fires and pushes the rocket A. The spaceship travels to its destination with its own fuel. B. The booster separates and drops when all the fuel it carries has used up. C. The multi-stage rocket is powerful enough to send the spaceship to its destination. D. The spaceship gets out of the Earth’s gravitation force and flies to its destination on its own. [单选题]间歇导尿期间每日饮水量控制在( )以内。P165
A.1000ml B. 1500ml C. 2000ml D. 3000ml E.2500 [单选题]境外放款以下哪个环节无需进行国际收支间接申报（ ）。
A. 展期 B. 资金汇出 C. 本金汇回 D. 利息汇回 [单选题]斜 Y 形坡口对接裂纹试件中间的试验焊缝不论板厚多少,一律( )。
A.只焊一道 B.只焊两道 C.只焊三道 D.只焊四道 [判断题]两人以上从事同一作业时，必须指定专人指挥，统一行动，相互配合，呼唤应答。
A.正确 B.错误 [单项选择]当实际施工进度发生拖延时，为加快施工进度而采取的组织措施可以是( )。
A. 改善劳动条件及外部配合条件 B. 更换设备，采用更先进的施工机械 C. 增加劳动力和施工机械的数量 D. 改进施工工艺和施工技术 [判断题]在列车运行时间内，可以进行影响行车的有关设备检修作业。（ ）
A.正确 B.错误 [单选题]各车站单程票保有量应不低于该车站日均单程票发售量的2倍。
A.正确 B.错误 C.3倍 [单选题]铝绞线、钢芯铝绞线的强度安全系数不应小于（ ）。
A.1.5 B.2 C.2.5 D.3 [判断题]《普修规》可动心轨辙叉道岔不宜采用垫板作业。
A.正确 B.错误 我来回答: 提交
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