更多“（）主要用于对木材进行纵向锯剖。”相关的问题
电报等级中的特级报代码为（）
A . DD
B . FF
C . SS
D . GG
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对于二套彼此有刚性联系的驱动装置，每套装置有两个支持制动器时，每一个的制动安全系数不低于（）。
A、1.1
B、1.25
C、1.5
D、1.75
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某煤矿开采企业为安全生产部部长设置了绩效考核指标系统。该考核指标体系应当包括哪些类别？请分别举例说明。
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设某雷达目标回波滞后于发射脉冲667μs，则（）。
A.该目标距飞机约为61.8km
B.该目标距飞机约为61.8海里
C.该目标距飞机约为100海里
D.该目标距飞机约为100km
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The Best Way to Reduce Your WeightYou hear this: "No wonder you are fat. All you ever do is eat." You feel sad: "I skip my breakfast and supper. I run every morning and evening. What else can I do" Basically you can do nothing. Your genes, not your life habits, determine your weight and your body constantly tries to maintain it.Albert Stunkard of the University of Pennsylvania found from experiments that, "80 percent of the children of two obese parents become obese, as compared with no more than 14 percent of the offspring of two parents of normal weight. "How can obese people become normal or even thin through dieting Well, dieting can be effective, but the health costs are tremendous. Jules Hirsch, a research physician at Rockefeller University, did a study of eight fat people. They were given a liquid formula providing 600 calories a day. After more than 10 weeks, the subjects lost 45 kg on average. But after leaving the hospital, they all regained. The results were surprising: by metabolic measurement, fat people who lost large amounts of weight seemed like they were starving. They had psychiatric problems. They dreamed of food or breaking their diet. They were anxious and depressed; some were suicidal. They hid food in their rooms. Researchers warn that it is possible that weight reduction doesn"t result in normal weight, but in an abnormal state resembling that of starved non-obese people.Thin people, however, suffer from the opposite: They have to make a great effort to gain weight. Ethan Sims, of the University of Vermont, got prisoners to volunteer to gain weight. In four to six months, they ate as much as they could. They succeeded in increasing their weight by 20 to 25 percent. But months after the study ended, they were back to normal weight and stayed there.This did not mean that people are completely without hope in controlling their weight. It means that those who tend to be fat will have to constantly battle their genetic inheritance if they want to significantly lower their weight.The findings also provide evidence for something scientists thought was true—each person has a comfortable weight range. The range might be as much as 9 kg. Someone might weigh 60-69kg without too much effort. But going above or below the natural weight range is difficult. The body resists by feeling hungry or full and changing the metabolism to push the weight back to the range it seeks.
A．Each person has a fixed weight range.B．Each person has a weight range of 9 kg.C．Each person wants to control his weight.D．Each person wants to eat to his heart" s content.
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下列哪类薄壁组织有较多的叶绿体，能够进行光合作用（）
\tA.基本薄壁组织
\tB.同化薄壁组织
\tC.贮藏薄壁组织
\tD.吸收薄壁组织
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下列药用部位为根的是（）
A.白芷
B.当归
C.羌活
D.柴胡
E.川芎
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置信系数1−a表达了置信区间的（）。
A.准确性
B.精确性
C.显著性
D.可靠性
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老年人用药，下列哪些用法是不安全的
A．胃虚寒老年患者，自行购买“醒脑降压丸”服用
B．老年人利尿降压宜选用吲达帕胺
C．长时间使用朱砂安神丸
D．如必须长期服用激素，需加服钙剂及维生素D
E．溃疡病患者长期服用冠心苏合丸
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负荷急剧增加而水位突然下降时，切不可开大给水。否则容易发生满水事故。
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压力容器在装料时应避免过急过量，液化气体严禁超量装载，并防止意外受热。
A.对 B.错
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下列各句中加点词语可以用括号内的词语替换的一句是( )
A.这粒扣子在草丛中被偶然(偶尔)发现，为侦破工作提供了线索。B.由于精神过分(过度)紧张，他在比赛中失利了，没能实现捧杯的梦想。C.类似的事情不止(不只)一次地发生，难道不该引起我们的警惕吗?D.班长与团支书一起合计(核计)着春游的事儿，不知不觉天已经黑了。
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治疗膀胱癌瘀血内阻证的代表方是（）
A.大补元煎
B.八正散或龙胆泻肝汤
C.桃红四物汤
D.知柏地黄丸
E.小蓟饮子
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对称型兰姆波的特点是薄板中心质点作（），上下表面质点作（），振动相位相反并对称于中心。
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