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【单选题】
核外电子的分层排有一定的规律的,各电子层最多容纳的电子数目为( )。
A.
2n²
B.
2n²+1
C.
2n²-1
D.
2n²+2
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【判断题】一般说来,地陪要等到旅游团所乘坐的交通工具启动之后才能离开,但外宾团离境站的地陪可以在游客进入安检口后离开。()
A.
正确
B.
错误
【单选题】下列叙述中,哪项不属于防治水污染的措施?( )。
A.
施工现场应设置排水沟及沉淀池,现场废水不得直接排入市政污水管网和河流
B.
现场存放的油料.化学溶剂等应设有专门的库房,地面应进行防渗漏处理
C.
食堂.盥洗室.淋浴间的下水管线应设置隔离网
D.
施工现场应设置密闭式垃圾站,施工.生活垃圾应分类存放,并及时清运出场
【单选题】You can go skating with your friends.   Don't ________. me here and there. [     ]
A.
worry
B.
follow
C.
walk
D.
after
【判断题】一般来说,地陪要等到旅游团所乘坐的交通工具启动之后才能离开,但外宾团离境站的地陪可以在游客进入安检口后离开。()
A.
正确
B.
错误
【简答题】阅读短文,选择正确答案。 My school is very big. It has six classrooms. There are three hundred students in it. I'm in Class 2, Grade 4. There are two doors and six windows in my classroom. On the teacher’s de...
【单选题】将光盘CD-ROM(hdc)安装到文件系统的/mnt/cdrom目录下的命令是( )。
A.
umount /dev/hdc
B.
mount /mnt/cdrom /dev/hdc
C.
mount /dev/hdc /mnt/cdrom
D.
mount /dev/hdc
【单选题】施工现场废水处理说法错误的是()。
A.
施工现场应设置排水沟及沉淀池;
B.
食堂应设置隔油池,并应及时清理;
C.
厕所的化粪池应进行抗渗处理;
D.
现场废水可以直接排入市政污水管网和河流。
【单选题】In many parts of the United States when Wal-Mart opens a new store, some smaller retailers go out of business. One of the reasons for this development could be that:
A.
Wal-Mart practices unfair pricing methods that reduce   consumer surplus over time.
B.
consumers in those areas receive no consumer surplus from Wal-Mart.
C.
consumers in those areas receive a larger consumer surplus from shopping at Wal-Mart than from the smaller stores.
D.
smaller stores increase prices to compete.
【单选题】—Welcome to our school, Mr. and Mrs. Richard. — _____ . [     ]
A.
We are pleased to meet you
B.
Thanks a lot for helping us so much
C.
I love your school a lot
D.
Thank you very much
【单选题】工程建设环境保护要求中,不属于防治水土污染的是( )。
A.
临时设施的建筑材料应符合环保、消防要求
B.
食堂应设置隔油池,并应及时清理
C.
施工现场应设置排水沟及沉淀池
D.
厕所的化粪池应做抗渗处理
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