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【判断题】
经常进行健美操锻炼,可促进大脑皮层兴奋,从而改善和提高中枢神经系统的活动能力()
A.
正确
B.
错误
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参考答案:
举一反三
【单选题】In the center of the lake are two islands, one of which is ______, if not larger than, the other. [     ]
A.
twice as large
B.
as twice large
C.
twice as large as
D.
as twice large as
【单选题】荧光物质的荧光强度与该物质的浓度成线性关系的条件是
A.
单色光
B.
稀溶液
C.
入射光强度一定
D.
样品池厚度一定
【单选题】已知圆 与直线 相切,则 (   )
A.
B.
C.
D.
0
【单选题】荧光物质的荧光强度与该物质的浓度成线性关系的条件是
A.
复色光
B.
ECL大于0.05
C.
入射光强度不一定
D.
样品池厚度一定
【单选题】. China has hundreds of islands, _____ is Taiwan.
A.
the largest of which
B.
of which largest
C.
which the largest
D.
in which the largest
【多选题】荧光物质的荧光强度与该物质的浓度成线性关系的条件是
A.
单色光
B.
Ecl≤0.05
C.
入射光强度 I 0 一定
D.
样品池厚度一定
【单选题】There are solid reasons for China to claim ownership of the Diaoyu Islands, which lie about 200 miles the eastern coast of our country.
A.
to
B.
on
C.
off
D.
of
【单选题】China has thousands of islands, the largest ___ is Taiwan.
A.
in which
B.
which
C.
in that
D.
of which
【单选题】荧光物质的荧光强度与该物质的浓度成线性关系的条件是( )
A.
单色光
B.
ECl≤0.05
C.
入射光强度I 0 一定
D.
样品池厚度一定
E.
A B C D
【多选题】怎样促进人与自然的和谐
A.
正确认识人对自然的依存关系
B.
科学把握人对自然的改造活动
C.
自觉珍爱自然,保护生态
D.
节约用水用电
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