【单选题】女性, 40岁.患慢性风湿性心脏瓣膜病,除具有原发症状外,突然出现一侧 下肢剧痛,动脉搏动消失,局部皮肤苍白、发凉、紫绀,应考虑是
【单选题】女性,40岁.患慢性风湿性心脏瓣膜病,除具有原发症状外,突然出现一侧剧痛,动脉搏动消失,局部皮肤苍白、发凉、紫绀,应考虑是
【单选题】常温下,用0.1000 mol/L NaOH溶液分别滴定20.00 mL 0.1000 mol/L 盐酸和20.00 mL 0.1000 mol/L 醋酸溶液,得到2条滴定曲线,如下图所示。 若以HA表示酸,下列说法正确的是 [ ]
B.
达到B、D状态时,两溶液中离子浓度均为c(Na + ) = c(A - )
C.
达到B、E状态时,反应消耗的n(CH 3 COOH)>n(HCl)
D.
当0 mL< V(NaOH) <20. 00 mL时,对应混合溶液中各离子浓度由大到小的顺序均为 c(A - )>c(Na + )> c(H + ) > c(OH - )
【单选题】女性,40岁.患慢性风湿性心脏瓣膜病,除具有原发症状外,突然出现一侧
A.
剧痛,动脉搏动消失,局部皮肤苍白、发凉、紫绀,应考虑是
【单选题】女性,40岁.患慢性风湿性心脏瓣膜病,除具有原发症状外,突然出现一侧下肢剧痛,动脉搏动消失,局部皮肤苍白、发凉、紫绀,应考虑是
【单选题】Dialogue One Dialogue one 1. What does" a friend in need is a friend indeed” mean?
A.
This means that a friend who helps you when you really need help is a true friend.
B.
This means that a friend who is willing to be with you when you are happy is a true friend.
C.
This means that a friend who likes to lend money to you is a true friend.
D.
This means that a friend who likes to share his wonderful things with you is a true friend.
【单选题】What does "common myth" mean in the passage?
A.
A traditional story or tale.
B.
A popular but wrong idea about something.
C.
A famous and wonderful idea about something.
【单选题】常温下,用0.1000 mol/L NaOH溶液分别滴定20.00mL 0.1000 mol/L盐酸和20.00 mL 0.1000 mol/L醋酸溶液,得到2条滴定曲线(如下图所示)以HA表示酸,下列说法正确的是( )
B.
滴定盐酸的曲线是图2 B、达到B、D状态时,两溶液中离子浓度均为c(Na + )=c(A - )
C.
达到B、E状态时,反应消耗的n(CH 3 COOH)>n(HCl)
D.
当0mL< V(NaOH)<20.00mL时,对应混合溶液中各离子浓度由大到小的顺序均为c(A - )>c(Na + )>c(H + )>c(OH - )
【单选题】常温下,用0.1000 mol/L NaOH溶液分别滴定20.00mL 0.1000 mol/L盐酸和20.00 mL 0.1000 mol/L醋酸溶液,得到2条滴定曲线,如下图所示: 以HA表示酸,下列说法正确的是
B.
达到B、D状态时,两溶液中离子浓度均为c(Na + )=c(A — )
C.
达到B、E状态时,反应消耗的n(CH 3 COOH)>n(HCl)
D.
当0mL< V(NaOH)<20.00mL时,对应混合溶液中各离子浓度由大到小的顺序均为c(A - )>c(Na + )>c(H + )>c(OH - )