【单选题】【消耗次数：1】
白僵蚕断面平坦，外层白色，中间棕色或棕黑色，具丝腺环
①
4个
②
3个
③
2个
④
1个
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相关题目
【单选题】
设关系R1具有a1个属性和b1个元组，关系R2具有a2个属性和b2个元组，则关系R1×R2所具有的属性个数为（ ）。
①
a1+b1
②
a2+b2
③
a1+a2
④
b1+b2
【单选题】
设关系R1具有a1个属性和b1个元组，关系R2具有a2个属性和b2个元组，则关系R1*R2所具有的元组个数为（ ）。
①
a1+b1
②
a2+b2
③
a1*a2
④
b1*b2
【单选题】
断面黄白色或淡黄棕色，皮部厚，有裂隙及多数棕色点状分泌腔，木部色较淡，形成层环黄棕色。有浓郁的香气，味甘、辛、微苦。该药材是
①
柴胡
②
前胡
③
白芷
④
防风
⑤
当归
【简答题】
一个包含4个框架的框架组对应着[填空1][填空2]个网页文件。
随机题目
【单选题】
Hurry up please, or I’ll be late.
①
Sorry sir, bur the traffic is thick now
②
Well, it’s alright, sir
③
How can you say that, sir?
④
Oh, we are going the right way
【单选题】
Are you ready to order desert, please?
①
Yes, please
②
Please don’t order it
③
No, don’t mention it
④
Yes, I’d like to have some chocolate cake
【单选题】
The donated liver came from the UK, but the hospital is giving no further __________ .
①
instance
②
character
③
items
④
details
【单选题】
Well, it’s getting late. I must be going. Thank you again for inviting me to the party.
①
Oh, it’s so late
②
Thank you for coming
③
Oh, so soon?
④
I really had a happy time
【单选题】
I won’t be able to attend the meeting tonight because _________ .
①
I must teach a class
②
I teach a class
③
I will be teaching a class
④
I will have been teaching a class
【单选题】
Excuse me, but can you tell me the way to the airport?
①
Don’t ask that
②
Sorry, I’m a stranger here
③
No, I can’t say that
④
No, you’re driving too fast
【单选题】
These two areas are similar __________ they both have a high rainfall during this season.
①
to that
②
besides that
③
in that
④
except that
【单选题】
Success results ___________ hard work, and hard work results in success.
①
from
②
in
③
by
④
with
【单选题】
David, there a dictionary and some books on your desk. Please put them away.
①
is
②
are
③
have
④
has
【单选题】
_________ is no reason for dismissing him.
①
Because he was a few minutes late
②
Owing to a few minutes being late
③
The fact that he was a few minutes late
④
Being a few minutes late