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单项选择题

对我国人口分布的叙述正确的是（）

A.高原人口稠密，盆地人口稀疏
B．少数民族集中在东部和中部地区
C．黑河-腾冲一线以东人口稠密
D．汉族在少数民族中人口数量最多
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相关考题

单项选择题
场监雷达使用STC的目的为（）
A.抑制近距离的干扰
B．控制发射信号
C．控制发射波形
D．控制接收信号的信号处理能力
未知题型
Overview This homework is purported to set up a writing workshop to help you finish the three writing assignment of the semester. The major assignment is to write a 700-word expository or argumentative essay on the passage of "Chinese or Western, It"s Time to Relax" from Unit 8, New Standard College English III. You can choose to support the opinion of the original passage or argue from a different view. You need to upload your first draft online before Dec. 29 before the peer review starts. By the following week of peer review workshop, you will have to read and grade SIX papers. The workshop ends on Monday, Jan. 5 in the coming new year. Then, you will receive feedbacks from your classmates and work on a further revision. The final revision is due in class on Jan. 12. Requirement You should follow the basic 5-paragraph structure of the English essay, which is composed of 1) an introduction, 2) 2~ 4 body paragraphs, and 3) a conclusion. The introductory paragraph should end with a thesis statement that clearly presents the topic of the essay. You should explore, explain and clarify the thesis through a focused, detailed, and purposeful exposition. A standard body paragraph is supposed to last 150~250 words. Peer Review Workshop Each of you will have to read and grade at least FIVE drafts from any others randomly assigned to your account. You are supposed to evaluate the draft and give some suggestions for the revision. If you do not fulfill the grading of five draft, your own grade will be reduced by 50%.
单项选择题
复方氨基酸液治疗肝性脑病的原理是什么（）
A.正常人血浆支链氨基酸与芳香族氨基酸的比例为（3-3.5）：1
B．当肾功能受损时，血浆芳香族氨基酸明显升高
C．支链氨基酸则明显减少
D．可纠正血浆氨基酸比例失衡
E．有明显改善症状、恢复脑功能的作用
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