更多“充装氧气的气瓶字样为（）。”相关的问题
以原子半径R为单位，fcc晶体的点阵常数a是（）。
A.2（2）1/2R
B.4（2）1/2R
C.4（3）1/2R
D.4（3）1/2/3
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蜂蜜炼制的目的是什么？蜂蜜炼制有哪些种类？特点如何？
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效应Tc细胞产生的细胞毒性物质主要包括（）、（）和（）。
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Laughter There is an old saying in English: "Laughter is the best medicine." Until recently, few people took the saying very seriously. Now, however, doctors have begun to investigate laughter and the effects it has on the human body. They have found evidence that laughter really can improve people’s health. Tests were carried out to study the effects of laughter on the body. People watched funny films, while doctors checked their heart rate blood pressure, breathing and muscles. It was found that laughter has similar effects to physical exercise. It increases blood pressure, the heart rate and the rate of breathing; it also works several groups of muscles in the face, the stomach, and even the feet. If laughter exercises the body, it must be beneficial. Other tests have shown that laughter appears to be capable of reducing the effect of pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programs. The group which tolerated the pain for the longest time was the group which listened to a funny program. The reason why laughter can reduce pain seems to be that it helps to produce endorphins(内啡肽) in the brain. These are natural chemicals which diminish both stress and pain. There is also some evidence to suggest that laughter helps the body’s immune system, that is the system which fights infection. In an experiment, one group of students watched a funny video while another group served as the control group—in other words, a group with which to compare the first group. Doctors checked the blood of the students in both groups and found that the people in the group that watched the video had an increase in the activity of their white blood cells, that is the cells which fight infection. As a result of these discoveries, some doctors and psychiatrists(精神病学) in the United States now hold laughter clinics, in which they try to improve their patients’ condition by encouraging them to laugh. They have found that even if their patients do not really feel like laughing, making them smile is enough to produce beneficial effects similar to those caused by laughter.
A. It reduces pain. B. It exercises the body. C. it improves the body’s immune system. D. It can cure cancer.
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骨髓检查原始粒细胞＞80%，早幼粒细胞12%，单核细胞＜20%的诊断是（）
\tA.急性非淋巴细胞白血病M1型
\tB.急性非淋巴细胞白血病M2a型
\tC.急性非淋巴细胞白血病M2b型
\tD.急性淋巴细胞胞白血病M3型
\tE.急性非淋巴细胞白血病M4型
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居民可以在境外自由持有外汇资产是指( )。
A.对内可兑换B．对外可兑换C．经常项目兑换D．资本项目兑换
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钢梁勾螺栓沾油或更换作业的目的是（）
A.防止钩螺栓锈蚀
B.按周期对钩螺栓进行保养
C.使螺栓外观统一
D.延长钩螺栓使用寿命
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《春宵》“歌管楼台声细细”下一句是（）。
A.春宵一刻值千金
B.花有清香月有阴
C.秋千院落夜沉沉
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预测企业人力资源需求是企业制定人力资源规划的基础工作。
A. 正确B. 错误
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乳剂型基质的特点不包括（）。
A . A、易于涂布
B . B、不适用于遇水不稳定的药物
C . C、O/W型基质需加防腐剂、保湿剂
D . D、可阻止分泌物分泌及水分蒸发
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已知两条空间直线L1：，L2：，这两条直线的位置关系为：（）
A.平行但不重合
B.重合
C.垂直
D.相交但不垂直
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恶性肿瘤化疗后易于复发，其原因是（）
A.M期细胞对抗肿瘤药物不敏感 B.S期细胞对抗肿瘤药物不敏感 C.G1期细胞对抗肿瘤药物不敏感 D.G0期细胞对抗肿瘤药物不敏感 E.G2期细胞对抗肿瘤药物不敏感
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关于牙齿早失后的间隙变化，说法错误的是（）
A.乳切牙早失间隙变小或消失的可能性较小
B.乳尖牙早失间隙极易变小甚至消失
C.第二乳磨牙早失，若第一恒磨牙正在萌出，磨牙间隙很容易缩小或消失
D.第一乳磨牙早失发生间隙丧失的情况较第二乳磨牙多见
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在半闭环位置伺服系统中常用光电编码盘测量电机转速和（）。
A.扭矩
B.电流
C.温升
D.角位移
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