患者,女性,63岁,脑卒中后左下肢肿胀一周,超声示左下肢深静脉血栓,现诉胸部不适,呼吸困难。肺灌注显像可见左肺上叶舌段血流灌注明显减低,右肺上叶尖段血流灌注减低。提示可能为肺栓塞。要进一步明确诊断,需要进行的检查为()。
A. 肺功能测定
B. 下肢静脉显像
C. 胸部平片或肺通气显像
D-二聚体测定
E. MRI
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You write a logging function for a Web Form. You call the logging function from the Page_Unload event handler. You test the Web Form and notice that the Page_Unload event handler does not call the logging function. You need to ensure that the logging function is called. What are two possible ways to achieve this goal? ()
A. Set the Page attribute to AutoEventWireup="False". Remove the attribute onunload="Page_Unload" from the Web Form element.
B. Set the Page attribute to AutoEventWireup="False". Add the attribute OnUnload="Page_Unload" to the Web Form element.
C. Set the Page attribute to AutoEventWireup="False". Add the Web Form attribute autocomplete=on.
D. Set the Page attribute to AutoEventWireup="True".
计算题: 测定某工业烧碱中NaOH和Na2CO3的质量分数,称取试样2.546g,溶于水并定容于250mL容量瓶中,取出25.00mL,以甲基橙为指示剂,滴定到橙色时,用去HCl标准溶液24.86mL。另取25.00mL溶液,加入过量BaCl2,以酚酞为指示剂,滴定到红色刚褪,用去HCl标准溶液23.74mL,又知中和0.4852g硼砂(Na2B4O7•10H2O)需要此HCl标准溶液24.37mL。计算该试样NaOH和Na2CO3的质量分数。 [M(Na2B4O7•10H2O)=381.4g•mol-1,Mr(NaOH)=40.00,M(Na2CO3)=106.0g•mol-1]