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【单选题】
宣传科学知识，揭露伪科学是我们的义务，下列各项中属于伪科学的是 [ ]A.
用催化剂将水变成汽油
B.
人不能用眼睛直接看到构成水的微粒
C.
干冰可用于人工降雨
D.
使用无氟冰箱可保护大气臭氧层
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举一反三
【简答题】简述普通股与优先股的区别。
【单选题】How long does the parcel post take to mail the package?
A.
Eight to ten days.
B.
About a month.
C.
One week.
D.
More than a month.
【简答题】下列主产于青藏的道地药材是 ( )A. 人参B. 冬虫夏草C. 三七D. 巴戟天A. 1 B. 1 C. 1 D. 1
【单选题】How long will the plan of putting out forest fire last?
A.
One week.
B.
Five days.
C.
Ten days.
D.
One month.
【单选题】How long did the trail last?
A.
Two days.
B.
The whole month of December.
C.
Ten days.
D.
Only the first week of December.
【单选题】How long will the woman go to Ischia?
A.
Six days.
B.
Two weeks.
C.
Ten days.
D.
One week.
【简答题】面对目前世界范围内的能源危机，甲醇作为一种较好的可再生能源，具有广泛的应用前景。 (1)已知在常温常压下反应的热化学方程式： ①CO(g)＋2H 2 (g) CH 3 OH(g) Δ H 1 ＝－90 kJ·mol － 1 ②CO(g)＋H 2 O(g) CO 2 (g)＋H 2 (g)Δ H 2 ＝－41 kJ·mol － 1 写出由二氧化碳、氢气制备甲醇的热化学方程式：____________...
【单选题】Which of theunderline expressions isthe hedging of the following sentences.There is experimental work to show that a week or ten days may not be long enough and a fortnight to three weeks is probably ...
A.
There is experimental work to show that a week or ten days may not be long enough and a fortnight to three weeks is probably the best theoretical period.
B.
There is experimental work to show that a week or ten days may not be long enough and a fortnight to three weeks is probably the best theoretical period.
C.
There is experimental work to show that a week or ten days may not be long enough and a fortnight to three weeks is probably the best theoretical period.
D.
There is experimental work to show that a week or ten days may not be long enough and a fortnight to three weeks is probably the best theoretical period .
【简答题】简述普通股与优先股的主要区别?
【简答题】【题干】简述普通股与优先股的区别。
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