更多“核糖核酸酶，去氧核糖核酸酶在高等动物的胰液中发现;核苷酶发现”相关的问题
Since that time he has ______ grown weaker and has been able to do less and less.
A. rarely
B. steadily
C. actively
D. probably
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肢体病怎么处理？（）
A.不调出，原栏位治疗B.调出，病猪栏治疗C.原栏治疗D.不做处理
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多式联运是多种运输方式参与的联合运输组织形式，按联合运输的地域范围划分，可分为（）多式联运和（）多式联运两种。
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type（1+2*3.14）的结果是（）。
A.〈class ‘int’〉B.〈class ‘float’〉C.〈class ‘str’〉D.〈class ‘complex’〉
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夏、商、周时期中国奴隶制国家结构是______
A.等级君主制
B.贵族共和制
C.君主专制
D.军事民主制
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网银数字证书的有效期是（）
A.5年
B.10年
C.15年
D.永久
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在现代，警察是指具有武装性质的维护社会秩序、惩治犯罪、保卫国家安全的国家行政力量。( )
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比率分析的基本形式有（）
A.百分率
B.比
C.周转天数
D.增长率
E.分数
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患儿，男，10岁，骤然起病，高热、咳嗽、咽部疼痛2天。查体：咽充血，咽峡部及舌面有少数疱疹，周围红晕，流涎，心肺正常，诊断为疱疹性咽峡炎。最佳治疗方案是（）
A.休息，多饮水
B.抗病毒药+抗生素
C.抗病毒药+解热镇痛药
D.抗生素+解热镇痛药
E.口腔局部涂甲紫
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观察力是智力结构的一个组成部分，培养学生的观察力是教学过程中的一项重要任务。()
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列检复示站红外线值班员遇到（）情况无法预报时，须立即通知列检人员进行人工摸轴检查。
A.设备发生临时故障暂时无法恢复时 B.设备受到干扰出现异常时 C.列车在探测站处调速停车时 D.因停电、维修、线路施工及其它因素等造成设备无法正常探测时
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“蚂蚊赛跑：如图所示，在结点v1，v2上的只蚂蚁跑过图的所有边（至少一次）到达目标v4，谁花费的时间多？（假设蚂蚊通过每一条边所花费的时间相同）
“蚂蚊赛跑：如图所示，在结点v1，v2上的只蚂蚁跑过图的所有边（至少一次）到达目标v4，谁花费的时间多？（假设蚂蚊通过每一条边所花费的时间相同）
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Do you want to know something about the history of weather Don’t look at the sky. Don’t look for old weather reports. Looking at tree rings is more important. Correct weather reports date back only one century, but some trees can provide an exact record of the weather even further back. It is natural that a tree would grow best in a climate with plenty of sunlight and rainfall. It is also expected that little sunlight or rainfall would limit the growth of a tree. The change from a favorable to an unfavorable climate can be determined by reading the pattern of rings in a tree trunk. To find out the weather of ten years ago, count the rings of a tree trunk from the outside to the inside. If the tenth ring is far from the other rings, then it is certain that plenty of sunny and rainy weather occurred. If the rings are close together, then the climate was bad for the tree. Studying tree rings is important not only for the history of weather, but also for the history of man. In a region of New Mexico you’ can find only sand-no trees and to people. However, many centuries ago a large population lived there. They left suddenly. Why A scientist studied patterns of dead rings which had grown there. He thought that the people had to leave because they had cut down all the trees. Trees were necessary to make fires and buildings. So, after the people destroyed the trees, they had to move. In this instance, studying tree rings uncovered an exciting fact about the history of man.
A．whether in that area the climate was favorable or notB．whether people took good care of the trees or notC．whether a particular tree was healthy or notD．whether a particular tree were
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