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【判断题】
“红小豆”是红豆的别名
A.
正确
B.
错误
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举一反三
【单选题】Definition of Resolution / Resolving Power
A.
It is based on the observation that two single-stranded nucleic acid molecules of complementary base sequence can form a double stranded hybrid.
B.
Technique whereby two different types of cells (from one organism or from different species) are joined to produce one cell with one, continuous plasma membrane .
C.
T he specimen is illuminated by a finely focused laser beam that rapidly scans across the specimen at a single depth, thus illuminating only a thin plane (or “optical section”) within the specimen .
D.
The smallest distance between two points on a specimen that can still be distinguished as two separate entities .
E.
They are made by identical immune cells from a unique parent cell .
【简答题】已知函数f(x)=log a (a-a x )且a>1, (1)求函数的定义域和值域; (2)讨论f(x)在其定义域上的单调性; (3)证明函数图象关于y=x对称.
【简答题】(本题满分10分) (1) 化简 (4分)    (2) 求函数 的定义域和值域.(6分)
【简答题】((本题14分)已知函数 ( )的图象过点(1,2),它的反函数的图象也过点(1,2)。 (1)求实数 的值,并求函数 的定义域和值域; (2)判断函数 在其定义域上的单调性(不必证明),并解不等式 。
【简答题】、(本小题满分14分) 设函数 ,其中实常数 。 (1)求函数 的定义域和值域; (2)试探究函数 的奇偶性与单调性,并证明你的结论。
【单选题】The resolving power (limit of resolution) of the light microscope is:
A.
2 mm
B.
2 μ m
C.
0.2 mm
D.
0.2 μ m
E.
0.02 mm
【简答题】简述带传动的优点? 2 .链传动的主要失效形式有哪些?
【简答题】The maximum resolution, or resolving power (the ability to distinguish two points) of a compound light microscope is ______μm; maximum magnification is__________.
【单选题】What is the maximum resolving power seen with a light microscope?
A.
2 centimeters
B.
2 millimeters
C.
2 nanometers
D.
2 micrometers
E.
2 angstroms
【简答题】Because the early microscopes lacked high resolving power, many species of ____________ were unknown.
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