下列方程组是二元一次方程组的是( ) A.x-y=1xy=2 B.4x-y=-1y=

题型:选择题

问题:

下列方程组是二元一次方程组的是(  )
A.
x-y=1
xy=2
B.
4x-y=-1
y=2x+3
C.
x2-x-2=0
y=x+1
D.
1
x
-1=y
3x+y=0
考点:二元一次方程组的定义
题型:选择题

中风的病位在()

A.心

B.脑

C.肝

D.肾

E.脾

题型:选择题

已知|x|=-x,那么x一定[ ]

A.大于零

B.小于零

C.等于零

D.小于或等于零

题型:选择题

在“绿叶在光下制造淀粉”的实验中,在验证实验结果以前要用酒精脱去叶绿素,目的是( )。

A.避免叶子继续进行光合作用,干扰实验结果

B.避免叶绿素颜色干扰,以使结果不明显

C.增加叶片内淀粉的含量

D.减少叶片内淀粉的含量

题型:选择题

Wendy ,Carol, Jenny, Tom 和Mark 想观看演出或参加培训.阅读下列材料, 从所给的6个选项中,选出符合各自要求的最佳选项。其中一项是多余的。(5分)

小题1:Wendy, a student who is interested comedy and acting,will be free on Oct.12th .She wants to relax herself by enjoying some performances, but she has no more than $4.

小题2:Carol is expected to be free on October 15th. She plans to enjoy some

performances while having a cup of coffee.

小题3:Jenny, a student who majors in art, is interested in Italian art as well as Chinese art. She will be free after school at 4:30.

小题4:Tom will go to study in the USA for a master’s degree. He wants to have a full-time special training for several months to improve his oral English.

小题5:Mark , a worker of an export company, needs to improve his writing and oral English. He can only go to the training class after work every day.

A.ENGLISHLANGUAGE CENTER

Classes for beginners for 3 months.

Focus on grammar as well as writing and oral English.

3:00 p.m to 9:30 p.m

Small classes with a maximum of 8 students

Course fee: $300 (10% discount for the first to enroll)

B.HALIFAX PLAYHOUSE

Ring’s Cross Street, Halifax.

Oct.10th--- Oct 17th on Golden Pond by Emest Thompson.

This is a magical comedy about real people. A well-acted play for everyone.

Don’t miss it.

Time: 7:30 p.m

Price: $3

Tel:36599988

C.LONDON COLLEGE OF ENGLISH

Classes for foreign students of all levels.

3 months, 6 months,9 months and 1 years course.

Focus on spoken language.

Open through all year from 8:00 a.m. to 5:00 p.m.

Small class with a maximum of 12 students.

Course fee for English for one year: ;$1,200

Discount at shorter period of study.

Tel:22342381

D.EXHIBITIONS OF OIL PAINTINGSGallery of the Central Academy of Fine Art

A combination of Eastern and Western Art 8:00 a.m.

Price: $2 for adults, $1 for students

Tel: 33569875

E.WESTERN ART SHOW

China National Art Museum

European modern art, Chinese art and African ancient art

Open from 7:30 a.m. to 4:00 p.m from Oct. 6th to 20th

Price : $3 for adults, $1.5 for middle school students.

Tel:25545569

F.GRAND THEATRE

Oxford Street, Leeds

Restaurant and Cafe.

Sep.1st—19th

Admission:Tues.--Thurs. $2-6; Fri.& Sat.$4-8

Sue Townsend’s musical play.

Time: Evenings 7:45. Oct 10th—17th, at 2:30 p.m.

No Monday performance.

All kinds of drinks offered

Tel :52011611

题型:选择题

给水引入管穿越承重墙及基础时,正确的安装应该是()。

A.应预留孔洞

B.应加套管

C.管顶上部净空间不宜小于0.15m

D.待管道安装完毕,应把洞口空隙填满,外抹强度等级52.5(525号)的水泥砂浆

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