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【判断题】
向量组的秩是惟一的.A.
正确
B.
错误
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举一反三
【单选题】According to the passage, the invention of the visible-light microscope allowed scientists to ______.
A.
see viruses directly
B.
develop the electron microscope later on
C.
understand more about the distribution of the chemical elements
D.
discover single-celled plants anal animals they had never seen before
【单选题】To observe the growth of mouse cells in culture bottles, which kind microscope is best?
A.
Bright field microscope
B.
Phase contrast-microscope
C.
Fluorescent microscope
【单选题】The microscope enables scientists to distinguish an incredible number and variety of bacteria.
A.
a selected
B.
a verifiable
C.
an unbelievable
D.
an unavoidable
【单选题】Which microscope does not rely on visible light?
A.
Simple microscope
B.
Compound microscope
C.
Phase contrast microscope
D.
Dissection microscope
E.
Transmission electron microscope
【单选题】It is difficult to discern the sample that is on the slide unless the microscope is adjusted.
A.
discard
B.
arrange
C.
determine
D.
disagreement
【单选题】The microscope enables scientists to distinguish an incredible number and variety of bacteria.
A.
unavoidable
B.
unchangeable
C.
unbelievable
D.
unpredictable
【简答题】What is a microscope used for?
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