亥姆霍兹方程<img src='https://img2.soutiyun.com/ask/2020-01-08/94732463546788.png' />对下列哪种情况成立( )
证明:对所有集合A,B和C,有<img src='https://img2.soutiyun.com/ask/2021-01-10/979154132976341.png' />
若函数<img src='https://img2.soutiyun.com/ask/2020-08-13/966178131180276.png' />,则<img src='https://img2.soutiyun.com/ask/2020-08-13/966178120045639.png' />。().此题为判断题(对,错)。
根据材料回答下列问题<img src='https://img2.soutiyun.com/shangxueba/ask/2028001-2031000/2028595/ct_ggxm_ggxdataanalysis_00971(200910).jpg' />2005年11月天然原油的生产量为()万吨。
对<img src='https://img2.soutiyun.com/ask/2019-12-13/945101669796507.png' />的反应,使用催化剂可以使( )。
下列对牵牛花综合征(如图)描述错误的是()<img src='https://img2.soutiyun.com/shangxueba/ask/17943001-17946000/17943066/2015110909573982879.jpg' />
<img src='https://img2.soutiyun.com/ask/2020-08-13/966180958370982.png' />对不对?为什么?
图中电位UB=4.4V。()<img src='https://img2.soutiyun.com/1/2021-01-13/97939639450219.png' />此题为判断题(对,错)。
配合物<img src='https://img2.soutiyun.com/ask/2020-10-13/971479285756121.png' />命名为硝酸二氯二(乙二酸)合钴。()此题为判断题(对,错)。
电极反应为<img src='https://img2.soutiyun.com/ask/2021-03-25/985519935449083.png' />; 电极反应为2Cl<sub>2</sub>+<img src='https://img2.soutiyun.com/ask/2021-03-25/985519957262723.png' />()此题为判断题(对,错)。
<img src='https://img2.soutiyun.com/ask/2021-03-23/985342956182369.png' />的反应一定自发进行。()此题为判断题(对,错)。
患者,女,28岁,1个月前在外院金属烤瓷冠修复,感觉颜色不自然,形态与天然牙不协调,并有一个牙崩瓷,要求重新修复。检查见:口腔内天然牙颜色,形态,排列基本正常。<img src='https://img2.soutiyun.com/shangxueba/ask/17907001-17910000/17908042/2015112909284646938.jpg' />金属烤瓷冠修复,颜色透明性较差,外形立体感不强。<img src='https://img2.soutiyun.com/shangxueba/ask/17907001-17910000/17908042/2015112909284722641.jpg' />远中切角崩瓷。<img src='https://img2.soutiyun.com/shangxueba/ask/17907001-17910000/17908042/2015112909284646938.jpg' />不松动,牙周状况无异常。上前牙排列整齐下前牙稍拥挤,<img src='https://img2.soutiyun.com/shangxueba/ask/17907001-17910000/17908042/2015112909284948366.jpg' />唇侧位,深覆盖。患者否认曾经咬硬物。构成颜色的三要素是().
图中这个标志提示前方路口只允许直行。()<img src='https://img2.soutiyun.com/shangxueba/ask/51849001-51852000/51850130/98743953800182.jpg' />此题为判断题(对,错)。
女,60岁。戴上下托牙一周,感嚼碎食物困难。查:<img src='https://img2.soutiyun.com/shangxueba/ask/18519001-18522000/18520663/2015082410160350282.jpg' />缺失,<img src='https://img2.soutiyun.com/shangxueba/ask/18519001-18522000/18520663/2015082410160350282.jpg' />托式可摘局部义齿,黏膜支持,人工牙较天然稍小,<img src='https://img2.soutiyun.com/shangxueba/ask/18519001-18522000/18520663/2015082410161733873.jpg' />面外形正常。咬合状态下,咬合纸可从上下牙之间抽出。造成嚼碎食物困难的原因是()。
对如图所示枝芽和枝条结构的叙述,错误的是()<img src='https://img2.soutiyun.com/shangxueba/ask/18540001-18543000/18542554/2017040615250336457.jpg' />
患者,男,60岁,口内检查<img src='https://img2.soutiyun.com/shangxueba/ask/17478001-17481000/17478786/2015113013524322509.jpg' />缺失,对颌为天然牙,无<img src='https://img2.soutiyun.com/shangxueba/ask/17478001-17481000/17478786/2015113013524518602.jpg' />,设计义齿为混合支持式可摘局部义齿,戴用义齿3天后疼痛,进行性加重。复诊检查剩余牙槽嵴大面积压痕,卡环固位可,咬合接触密合。其疼痛原因最可能是().
农业化肥使用会增加河水中的NO<img src='https://img2.soutiyun.com/shangxueba/ask/17634001-17637000/17636728/201511031644208192.jpg' />,工业废水和生活污水排放会增加河水中的PO<img src='https://img2.soutiyun.com/shangxueba/ask/17634001-17637000/17636728/2015110316442160967.jpg' />。下表为亚马孙河、密西西比河、长江、黄河四条河流中NO<img src='https://img2.soutiyun.com/shangxueba/ask/17634001-17637000/17636728/201511031644208192.jpg' />和PO<img src='https://img2.soutiyun.com/shangxueba/ask/17634001-17637000/17636728/2015110316442160967.jpg' />的浓度数据。贝加尔湖对湖区环境的影响是()
以下哪个因素对<img src='https://img2.soutiyun.com/shangxueba/ask/18213001-18216000/18215873/2015082010030416555.jpg' />力无影响()。
对如下心脏左侧位片描述正确的是()<img src='https://img2.soutiyun.com/shangxueba/ask/17592001-17595000/17594532/2015113016590636977.jpg' />
对右肺(见图)的描述,正确的是()<img src='https://img2.soutiyun.com/shangxueba/ask/17595001-17598000/17595100/2015113017073659155.jpg' />
若<img src='https://img2.soutiyun.com/latex/latex.action' />,<img src='https://img2.soutiyun.com/latex/latex.action' />试证明时域卷积定理<img src='https://img2.soutiyun.com/latex/latex.action' />和频域卷积定理<img src='https://img2.soutiyun.com/latex/latex.action' />
若向量β不能由<img src='https://img2.soutiyun.com/ask/2021-01-01/978361429025286.png' />线性表示,则向量组<img src='https://img2.soutiyun.com/ask/2021-01-01/978361441040973.png' />线性无关()此题为判断题(对,错)。
对图示的AB段,采用叠加法作弯矩图是()。<img src='https://img2.soutiyun.com//1/2021-05-31/991319579783955.png' />
函数<img src='https://img2.soutiyun.com/ask/2020-08-13/966178166495296.png' />在xOy平面处处连续。().此题为判断题(对,错)。