一个23892U原子核衰变为一个20682Pb原子核发生β衰变的次数为（）。
| Every group has a culture, however
uncivilized it may seem to us. To the professional anthropologist, there is no
intrinsic superiority of one culture over another, just as to the professional
linguist, there is no intrinsic hierarchy among languages. People once thought of the languages of backward groups as undeveloped. While it is possible that language in general began as a series of grunts and groans, it is a fact established by the study of "backward" languages that no spoken tongue answers that description today. Most languages of uncivilized groups are, by our most severe standards, extremely complex. They differ from Western languages not in their sound patterns or grammatical structures, which usually are fully adequate for all language needs, but only in their vocabularies, which reflect the objects and activities known to their speakers. A. there is no intrinsic superiority of cultures B. there is no intrinsic hierarchy of languages C. all languages came from grunts and groans D. all languages are most severe and standard [判断题]列车或单机在车站时，所有乘务人员应按司机的指挥进行工作。
A.正确 B.错误 [多选题]马克思主义是（）。
A.A、以世界的本质及其发展的一般规律为根本研究对象、是关于世界的普遍本质及其发展的一般规律的科学 B.B、是关于人类社会发展的一般规律、 C.C、马克思主义是一种意识形态、即现代无产阶级的意识形态 D.D、是关于无产阶级和人类解放的科学 [单项选择]Australia is the world's _____ continent.
A. smallest B. coldest C. warmest D. lowest [判断题]有限空间作业前，应确定作业人员是否具备有限空间安全作业知识及技能，作业人员身体状况是否良好。
A.正确 B.错误 [单项选择]紫萁贯众的原植物为
A. 体轻，质松，易折断，断面粉质，显疏松层纹 B. 质松而韧，横断面可见外层为海绵状物，内层为许多小室，室内有卵 C. 质硬而脆，断面平坦，外层白色，中间有亮棕色或亮黑色的丝线环4个 D. 体轻，中空，易碎，表面黄棕色半透明 E. 体轻，骨质坚硬，“马头，蛇尾，瓦楞身” [单选题]当NH3浓度超过( )可引起严重咳嗽、支气管痉孪。
A.1700PPM B.500PPM C.600PPM D.1000PPM 我来回答: 提交
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