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【单选题】
不是食品中挥发酸成分的是( )A.
丁酸
B.
甲酸
C.
醋酸
D.
乳酸
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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
【多选题】下列对于电路连接叙述正确的是()。
A.
实时性强，时延小，交换设备成本较低
B.
线路利用率低，电路接续时间长，通信效率低，
C.
适用于信息量大、长报文、经常使用的固定用户之间的通信
D.
基于存储——转发技术
E.
同时传送多个数据分组
【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
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