针对某一时期的煤矿安全工作重点，组织( )。A．日常监察 B．重点监察 C．定期监

牙髓充血区别于浆液性牙髓炎的特点是无自发性痛。

以下关于静电现象的说法中，不正确的是[ ]

A．穿着化纤服装的人在晚上脱衣服时，常常会看见闪光并伴有轻微的“噼啪”声，这是由于摩擦起电所造成的现象

B．摩擦起电产生的电压总是很低的，因此对人并不会造成伤害

C．脱化纤服装时，由于摩擦起电所产生的电压可能高达几千伏以上

D．脱化纤服装时，由于摩擦起电所产生的静电能量很微小，通常不会对人造成伤害

鼻粘膜血管的特征有（）。

A.内皮基膜不连续

B.小动脉壁缺乏弹力层

C.毛细血管与小静脉之间形成海绵状血窦

D.粘膜固有层和粘膜下层有多种免疫活性细胞

E.非常丰富

波士顿矩阵可用来______

A．分析公司间的博弈
B．确定资源组合
C．给员工发工资
D．缓解企业财务危机

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.

（75）处填（）。

A．microimage

B．holograph

C．thumbnail

D．bitmap