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【单选题】
下列关于元素周期表的说法正确的是( )A.
元素周期表短周期中有6种金属元素
B.
元素周期表中第ⅦA族有4种非金属元素
C.
元素周期表中第1、2、3周期为短周期
D.
元素周期表中第ⅠA族全部是金属元素
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反馈参考答案：
举一反三
【多选题】In the ancient times, people needed to so they .
A.
rely on nature to survive
B.
held it in awe
【单选题】在分离条件下,药物中间体吲哚羧酸产品中所有主副产品及杂质都能分离,且都出峰,使用下列何种方法定量最简单( )。
A.
归一化法
B.
外标法
C.
内标法
D.
标准加入法
【单选题】In this passage, the “general concourse” for arriving passengers refers to ______.
A.
baggage claim area
B.
immigration checkpoint
C.
green and red channel
D.
greeting hall
【单选题】IP地址是202.114.18.10,掩码是255.255.255.252,其广播地址是( )。
A.
202.114.18.255
B.
202.114.18.12
C.
202.114.18.11
D.
202.114.18.8
【简答题】In 1981, what was the cave declared as?
【单选题】In France, how you address someone, both in person and in correspondence, tends to be:
A.
More formal than many other countries.
B.
Less formal than many other countries.
C.
The same level of formality as in many other countries.
D.
Dependent on how well the two of you know each other.
【单选题】IP 地址是 202.114.18.10,掩码是 255.255.255.252,其广播地址是多少?
A.
202.114.18.11
B.
202.114.18.12
C.
202.114.18.8
D.
202.114.18.255
相关题目：
【多选题】In the ancient times, people needed to so they .
A.
rely on nature to survive
B.
held it in awe
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