男，56岁。头部摔伤1个月，头痛、呕吐3天，CT示右颞顶新月形等密度病灶，中线轻度移

井下各级配电电压和各种电气设备的额定电压等级应符合哪些规定？

爆炸性粉尘属于（）爆炸性物质。

A．I类 

B．Ⅱ类 

C．Ⅲ类 

D．Ⅳ类

Directions:Complete the following passage by filling in each blank with one word that best fits the

context.

     The long history of the Chinese Knot (中国结) dates back to ancient times

when people first used knots for fastening, wrapping, hunting and fishing. The

knot was developed into  1.________   art form during the Tang and Song

dynasties and later popularized in the Ming and Qing Dynasties.

One major characteristic of decorative knot work is that all the knots are tied

using one thread.   2.________   finished, the knot looks identical (一模一样

的)from both the front and back. They can come in a variety of colors such as:

gold, green, blue  3.________  black, and however, the most commonly used

color is red. 4.________  is because it symbolizes good luck and prosperity

(兴旺).

   Crafting (精心制作) the Chinese knot is a threestep process,   5.________ 

 involves tying, tightening and adding.  6.________  are many different shapes

of Chinese knots, offering blessings of happiness, love and good luck. In Chinese,

"knot" means reunion (团圆), friendliness, warmth, love, etc. Up to  7.________,

the art of the Chinese Knot has been used in necklaces, buttons and even hangings 

 8.________  cars or mobile phones.

目前，我国渔类资源遭到严重破坏，其主要原因是（）

A.不实行以养为主

B.在禁渔区和禁渔期捕劳

C.严重的水污染和乱捕乱捞

D.使用禁用渔具

感温膨胀阀送至蒸发器的冷媒为（）。

A.高压液体

B.高压气体

C.低压液体

D.低压气体

E.中等压力，且为气体