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问题 单项选择题

视杆细胞、视锥细胞与双极细胞间的信息传递是由哪种递质介导的

A．去甲肾上腺素
B．乙酰胆碱
C．谷氨酸
D．甘氨酸

答案

参考答案：C

解析：[考点] 感光细胞与双极细胞间信息传递
目前比较明确的是视杆细胞、视锥细胞与双极细胞间的信息传递是由谷氨酸介导的。

单项选择题

《卷烟》国标规定卷烟感官质量记分采用百分制，其中光泽最高为（）。

A.6

B.7

C.8

D.9
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单项选择题

Ink-jet printer belongs to nonimpact printers in which the characters are formed by projecting particles or droplets of ink on to paper. (71) printer is also a n0nimpact printer in which the characters are produced by applying hot elements to heat-sensitive paper directly or by melting ink from a (72) on to plain paper. Electrostatic printer creates an electrostatic latent image, which is then made visible by a toner and transferred and fixed on paper. An electrostatic printer may be used in some instances as a (73) . Laser printer creates, by means of a laser beam directed on a (74) surface, a latent image which is then made visible by a toner and transferred and fixed on paper. Magnetographic printer creates, by means of magnetic heads operating on a metallic drum, a latent image which is then made visible by a toner and transferred and fixed on paper. Computer-output-microfilm (COM) printer produces on a photographic film a (75) of each page.

（72）是（）

A.belt

B.ribbon

C.tape

D.band
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