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【单选题】
下图是 0-1 背包问题实例n=3, C=25,w[]={10,15,20},v[]={20,30,25}的解空间树, 用回溯法搜索解空间树,因为不满足约束函数被剪枝的节点有( )
A.
③ ⑦
B.
③ ⑤
C.
④ ⑤
D.
④ ⑦
拍照语音搜题，微信中搜索"皮皮学"使用
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【单选题】We will call you all about the results, but you leave your name and phone number with Jim. [     ]
A.
if only
B.
as if
C.
even if
D.
only if
查看完整题目与答案
【单选题】液压油系中输出流量往往是动的,下列哪个泵脉动最小()
A.
齿轮泵
B.
叶片泵
C.
螺杆泵
D.
柱塞泵
查看完整题目与答案
【单选题】什么事门市服务留给顾客的一种心理感觉?
A.
礼貌
B.
一视同仁
C.
较强的推销能力
D.
亲和力
查看完整题目与答案
【单选题】在滴定分析中，所使用的滴定管中沾有少量纯化水，使用前
A.
必须在红外干燥器中干燥
B.
不必进行任何处理
C.
必须用少量待盛溶液洗涤 2 ～ 3 次
D.
用洗液浸泡处理
查看完整题目与答案
【单选题】听力原文：M: Where have you been all this time? The train is about to leave. W: I'm sorry Jim, I'm late, but I was waiting for you at the information desk upstairs. Q: Where did the woman think they were s...
A.
At the information desk.
B.
On the train.
C.
On the platform.
D.
Near the stairs.
查看完整题目与答案
【简答题】1) I can’t eat this. I’ve tried it and it_________ awful. 2) I wasn’t very well yesterday, but I _________ better today. 3) What beautiful flowers! They__________good. 4) The man _____________ angry w...
查看完整题目与答案
【单选题】Section A Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and the...
A.
At the information desk.
B.
On the train.
C.
On the platform.
D.
Near the stairs.
查看完整题目与答案
【多选题】移动模架的主梁的有关描述正确的是（ ）。
A.
移动模架的主梁一般由承重主梁和导梁组成，主梁是移动模架的主要承重结构，是整个移动模架结构的核心，一般可采用钢箱梁、钢板梁和钢桁架梁等结构类型。
B.
主梁一般根据桥垮长度、场地运输条件和现场吊装能力分段制造，而后拼装组成，节与节之间以高强承剪螺栓及钢板相连，主梁前、后端设有导梁，起到模架向下一孔移动时的引导和承重作用。
C.
移动模架最常见的主梁下面有两条轨道置于滚轮上，内侧与横梁由摩擦型高强度螺栓连接。
D.
行式移动模架主梁顶部设有螺旋千斤顶支撑模板（便于调节模板的高程），主梁和导梁的下弦设有通道供人行走。下行式移动模架主梁根据下部构造情况一般由2根主梁组成，并视桥宽每根主梁可采用单梁或双梁。
查看完整题目与答案
【判断题】这幅作品用到了扭曲工具
A.
正确
B.
错误
查看完整题目与答案
【简答题】Mr and Mrs King have two children, Jim and Liz. The whole family are all busy, so they often leave notes to each other. Read these four notes today to know something about them. 3:30 p.m. To dad and m...
查看完整题目与答案
相关题目：
【单选题】We will call you all about the results, but you leave your name and phone number with Jim. [     ]
A.
if only
B.
as if
C.
even if
D.
only if
查看完整题目与答案
【单选题】液压油系中输出流量往往是动的,下列哪个泵脉动最小()
A.
齿轮泵
B.
叶片泵
C.
螺杆泵
D.
柱塞泵
查看完整题目与答案
【单选题】什么事门市服务留给顾客的一种心理感觉?
A.
礼貌
B.
一视同仁
C.
较强的推销能力
D.
亲和力
查看完整题目与答案
【单选题】在滴定分析中，所使用的滴定管中沾有少量纯化水，使用前
A.
必须在红外干燥器中干燥
B.
不必进行任何处理
C.
必须用少量待盛溶液洗涤 2 ～ 3 次
D.
用洗液浸泡处理
查看完整题目与答案
【单选题】听力原文：M: Where have you been all this time? The train is about to leave. W: I'm sorry Jim, I'm late, but I was waiting for you at the information desk upstairs. Q: Where did the woman think they were s...
A.
At the information desk.
B.
On the train.
C.
On the platform.
D.
Near the stairs.
查看完整题目与答案
【简答题】1) I can’t eat this. I’ve tried it and it_________ awful. 2) I wasn’t very well yesterday, but I _________ better today. 3) What beautiful flowers! They__________good. 4) The man _____________ angry w...
查看完整题目与答案
【单选题】Section A Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and the...
A.
At the information desk.
B.
On the train.
C.
On the platform.
D.
Near the stairs.
查看完整题目与答案
【多选题】移动模架的主梁的有关描述正确的是（ ）。
A.
移动模架的主梁一般由承重主梁和导梁组成，主梁是移动模架的主要承重结构，是整个移动模架结构的核心，一般可采用钢箱梁、钢板梁和钢桁架梁等结构类型。
B.
主梁一般根据桥垮长度、场地运输条件和现场吊装能力分段制造，而后拼装组成，节与节之间以高强承剪螺栓及钢板相连，主梁前、后端设有导梁，起到模架向下一孔移动时的引导和承重作用。
C.
移动模架最常见的主梁下面有两条轨道置于滚轮上，内侧与横梁由摩擦型高强度螺栓连接。
D.
行式移动模架主梁顶部设有螺旋千斤顶支撑模板（便于调节模板的高程），主梁和导梁的下弦设有通道供人行走。下行式移动模架主梁根据下部构造情况一般由2根主梁组成，并视桥宽每根主梁可采用单梁或双梁。
查看完整题目与答案
【判断题】这幅作品用到了扭曲工具
A.
正确
B.
错误
查看完整题目与答案
【简答题】Mr and Mrs King have two children, Jim and Liz. The whole family are all busy, so they often leave notes to each other. Read these four notes today to know something about them. 3:30 p.m. To dad and m...
查看完整题目与答案