如图所示，一辆重120牛的小车受到60牛水平向右的拉力，画出小车所受到的重力和拉

指定监护人只能在未成年人的近亲属中进行。

四岁幼儿体温39~40℃，流涕，眼睑水肿，眼结合膜充血，耳后发际可见红色斑丘疹，疹间皮肤正常。

患儿住院后咳嗽加重，声嘶、犬吠样咳嗽，吸气性呼吸困难，可能的并发症是（）

A.支气管炎

B.肺炎

C.喉炎

D.呼吸衰竭

E.心力衰竭

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）处填（）。

A．belt

B．ribbon

C．tape

D．band

有一水泥试样，用雷氏法测定其安定性，测试数据如表所示。经计算判断该水泥试样的安定性是（）。

A.不合格

B.合格

C.应立即重做

D.应立即用试饼法重做，并以试饼法结果为准

北京市NOX排放量保证在（）以下。

A.250mg/Nm³

B.200mg/Nm³

C.100mg/Nm³

D.150mg/Nm³