更多“震颤是指（）”相关的问题
中国的育种技术是以传统的（）技术为基础，发展至现在的复合育种技术。
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《铁路旅客运输规程》有下列行为时，除按规定补票，核收手续费以外，铁路运输企业有权对其身份进行登记，并须加收已乘区间应补票价50％的票款：持站台票上车并在开车（）仍不声明时，按无票处理。
\tA.20分钟
\tB.25分钟
\tC.30分钟
\tD.50分钟
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进行业务抽样时，应按照尽量覆盖整个检查期和全部发生单位的原则确定抽样比例或数量，比例最低不少
A.45%B.40%C.30%D.35%
B.40%C.30%D.35%
C.30%D.35%
D.35%
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A . 物理性创伤B . 化学物质中毒C . 感染D . 遗传性疾病E . 营养代谢障碍
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肩关节脱位常合并的骨折部位是（）。
A.肱骨头
B.肱骨外科颈
C.肱骨大结节
D.肱骨小结节
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根据国家标准规定，热水管的规定代号为（）。
A.R B.S C.X D.H
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要做好动静活动结合，脑力与体力活动的结合，室内和室外活动的结合，使（）
A.婴幼儿生活规律，娱乐快乐
B.婴幼儿饮食规律，精神愉快
C.婴幼儿生活规律，精神愉快
D.婴幼儿二便规律，精神快乐
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Text 4 It is hard to get any agreement on the precise meaning of the term "social class"...What happened to the class differences in the twentieth century
A．They have been partly smoothed out.
B．They increased taxation of higher incomes.
C．They have made the social services grow.
D．They widely enhanced the education development.
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近代的大型泵则多采用阶梯式轴，不等孔径的叶轮用热套法装在轴上，并采用渐开线花键代替过去的短键。这种方法叶轮与轴之间（）间隙，不致有轴间窜水和冲刷，但拆装较困难。
A . 有
B . 没有
C . 有较小
D . 有较大
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Previous research by scientists from Keil University in Germany monitored Adelie penguins and noted that the birds" heart rates increased dramatically at the sight of a human as far as 30 meters away. But new research using an artificial egg, which is equipped to measure heart rates, disputes this. Scientists from the Scott Polar Research Institute at Cambridge say that a slow moving human who does not approach the nest too closely, is not perceived as a threat by penguins.The earlier findings have been used to partly explain the 20 per cent drop in populations of certain types of penguins near tourist sites. However, tour operators have continued to insist that their activities do not adversely affect wildlife in Antarctica, saying they encourage non-disruptive behavior in tourists, and that the decline in penguin numbers is caused by other factors.Amanda Nimon of the Scott Polar Research Institute spent three southern hemisphere summers at Cuverville Island in Antarctica studying penguin behavior towards humans. "A nesting penguin will react very differently to a person rapidly and closely approaching the nest," says Nimon. "First they exhibit large and prolonged heart rate changes and then they often flee the nest leaving it open for predators (捕食者) to fly in and remove eggs or chicks." The artificial egg, specially developed for the project, monitored both the parent who had been disturbed when the egg was placed in the nest and the other parent as they both took it in turns to guard the nest.However, Boris Culik, who monitored the Adelie penguins, believes that Nimon"s findings do not invalidate his own research. He points out that species behave differently—and Nimon"s work was with Gentoo penguins. Nimon and her colleagues believe that Culik"s research was methodologically flawed because the monitoring of penguins" responses entailed capturing and restraining the birds and fitting them with heart-rate transmitters. Therefore, argues Nimon, it would not be surprising if they became stressed on seeing a human subsequently.
A．penguins near tourist sites in Antarctica have been disrupted by the tourist activitiesB．penguin parents both take turn to guard their nest and look after their eggs or chicksC．penguins are not threatened by a human who approaches the nest slowly and distantlyD．penguins abandon the nest leaving eggs or chicks unprotected whenever seeing a human
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速度继电器的电气文字符号是:( ) A . KA B . K S C . SB D . KM
A. KA B. K S C. SB D. KM
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河北省辖( )个地级市。
A.9 B.10 C.11 D.12
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下列叙述中正确的是( )。
A．黑箱(盒)测试方法完全不考虑程序的内部结构和内部特征B．黑箱(盒)测试方法主要考虑程序的内部结构和内部特征C．白箱(盒)测试不考虑程序内部的逻辑结构D．上述3种说法都不对
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在（），亲子间的关系逐渐趋于对等。
A.儿童期
B.青少年期
C.成年早期
D.成年晚期
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