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【多选题】
饱和氨水中存在化学平衡和电离平衡: NH 3 + H 2 O NH 3 · H 2 O NH 4 ( + ) + OH - 。下列有关说法正确的是A.
常温下饱和氨水的 pH>7
B.
电离是吸热过程，升高温度，上述平衡均正向移动
C.
向氨水中滴加过量盐酸，上述平衡均正向移动， pH 减小
D.
向氨水中加入少量 NaOH 固体，上述平衡均逆向移动， NH 3 的电离程度减小
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【判断题】In the abstract of a research paper, just present a couple of important results, and don't try to cram a lot of numbers into this part.
A.
正确
B.
错误
【判断题】Research background in the abstract of a research paper tends to be lengthy and detailed.
A.
正确
B.
错误
【单选题】小球重P，置于光滑的圆柱面上，图（a）和图（b）为所画受力图，则（ ）。A．【图片】与【图片】是一对平衡力系 B．【图片】与P是作用力与反作用力C．【图片】与【图片】是作用力与反作用力 D．【图片】与P是作用力与反作用力【图片】
A.
C
B.
A
C.
B
D.
D
【单选题】In the abstract of a review article, there are usually five moves, after the move of indicating the reviewed focus, what might follow closely is the move that describes:
A.
the background
B.
the conclusion
C.
the reviewed details
【多选题】what are the following tense we may use to write about the research objectives in the abstract of a research paper?
A.
Simple present tense
B.
Simple past tense
C.
Present perfect tense
D.
Future tense
【单选题】Modal verbs are sometimes used in the abstract of a review article to:
A.
Illustrate the author’s conclusion
B.
Expose the main idea of the paper
C.
Emphasize on the future trend
【单选题】In the abstract of a review article, there are usually five moves, after the move of indicating the reviewed focus, what might follow closely is the move that describes:
A.
the background
B.
the conclusion
C.
the reviewed details
D.
the significance of the review
【多选题】what are the following tense may be used when we write about the research objectives in the abstract of a research paper
A.
Simple present tense
B.
Simple past tense
C.
Present perfect tense
D.
Future tense
【简答题】球重 P ,置于光滑的圆柱面上,图(a)和(b)为所画受力图, 请您:(1)指出所有力的大小关系;(2)各力的施力物是谁?(3)哪一对力是平衡的二力?(4)哪一对力是作用力和反作用力?
【简答题】大革命失败的意义?
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