气动薄膜调节阀的气源压力的最大值为()。A、200kpa B、400kpa C、600k

题型:单项选择题

问题:

气动薄膜调节阀的气源压力的最大值为()。

A、200kpa

B、400kpa

C、600kpa

D、800kpa

考点:CNG加气站操作工CNG加气站中级操作工CNG加气站中级操作工题库
题型:单项选择题
方程x2+y2+2x-4y-6=0表示的图形是(  )
A.以(1,-2)为圆心,11为半径的圆
B.以(-1,2)为圆心,11为半径的圆
C.以(-1,2)为圆心,
11
为半径的圆
D.以(1,2)为圆心,
11
为半径的圆
题型:单项选择题

某人接种了“甲型H1N1流感”疫苗,一段时间后体内出现了相应的抗体,产生抗体的细胞是[ ]

A.吞(巨)噬细胞

B.效应T细胞

C.浆细胞

D.记忆细胞

题型:单项选择题

Are you looking for some new and exciting places to take your kids (孩子) to? Try some of these places:

. Visit art muvewns. They offer a variety of activities to excite your kids' interest. Many offer workshops for making land-made pieces, traveling exhibits, book signings by children's favorite writer, and even musical performances and other arts

Head to a natural history museum. This is where kids can discover the past from dinosaur(恐龙) models to rock collections and pictures of stars in the sky. Also, ask what kind of workshops and educational programs are prepared for kids and any special events that are coming up.

Go to a Youtheater. Look for one in your area offering plays for child and family visitors. Pre-show play shops are conducted by area artists and educators where kids can discover the secret about performing arts- Puppet(木偶)making and stage make-up are just a couple of the special offerings you might find.

Try hands-on science. Visit one of the many hands-on science museums around the country. These science play-lands are great fun for kids and grown-ups alike. They'll keep your child mentally and physically active the whole day through while pushing buttons, experimenting, and building. When everyone is tired, enjoy a fun family science show, commonly found in these museums.

小题1:If a child is interested in the universe, he probably will visit        

A.a Youtheater

B.an art museum

C.a natural history museum

D.a hands-on science museum小题2:What can kids do at a Youtheater?

A.Look at rock collections.

B.Watch puppet making.

C.See dinosaur models.

D.Give performances.小题3:Where does this text probably come from?

A.A science textbook.

B.A tourist map.

C.A museum guide.

D.A news report.

题型:单项选择题

诊断化脓性腹膜炎的主要依据是()

A.病人是否有脉快和休克

B.白细胞计数增高

C.腹部有无压痛、反跳痛、肌紧张

D.腹腔穿刺结果

E.腹部X线摄片结果

题型:单项选择题

目前世界上95%以上的Al2O3均是用()法生产的。

A、拜耳法

B、烧结法

C、联合法

D、酸法

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