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【简答题】
同一周期主族元素,从左到右,电子亲和能的代数值逐渐________(填增大或减小)。 同一主族元素,从上到下,电子亲和能逐渐________(填增大或减小)。
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反馈参考答案：
举一反三
【简答题】影响学前儿童健康的生物学因素包括()()()
【单选题】The food is good at this hotel,but the ____ is poor;the waiters don’t seem to be well trained.
A.
maintenance
B.
repair
C.
charge
D.
service
【单选题】The food is good at this hotel, but the_____is poor; the waiters don’t seen to be well trained.
A.
service
B.
repair
C.
charge
D.
maintenance
【单选题】The food is good at this hotel, but the ___ is poor; the waiters don't seem to be well trained.
A.
maintenace
B.
repair
C.
charge
D.
service
【单选题】According to the passage, which of the following can be found in the greatest number of different climate area on earth?
A.
Penguins.
B.
Camel
C.
Bears.
D.
Mosses.
【单选题】According to the passage, which of the following can be found in the greatest number of different climate areas on Earth?
A.
Reef corals
B.
Penguins
C.
Bears
D.
Camels
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