【简答题】取标示量为10mg的维生素B1片20片,总重为1.6208g,研细。平行测定,称出供试品2份,分别为0.4082g、0.4154g,按药典规定用紫外分光光度法测定。分别先配成100ml溶液,滤过后,取续滤液1ml稀释为50ml,照分光光度法在246nm波长处测定吸光度分别为0.407、0.415,按C12H17ClN4OS·HCl的吸收系数()为421计算,试问该片剂的标示百分含量是多少?是否符合...
【简答题】羽毛球场各条线宽均为 厘米,场地上空 米内和四周 米以内不应有障碍物。
【单选题】某患者,患肝炎多年,近来出现腹水,腹部隆起,欲查肝脾肿大情况,应选择哪种触诊方法
【单选题】The probability that a residue in a protein is part of a ( ) structure was assessed by comparison of its flanking sequences with sequences of known proteins. A. coil-coil B. coiled-coil C....
【判断题】在Hyper-V中,“内部”类型的虚拟交换机,能够实现与其相连的虚拟机之间进行通信,以及虚拟机与所在Hyper-V服务器之间通信。
【单选题】Magnetic field strength in a long coil is determined by?
A.
Applied current strength
B.
Number of turns in the coil
D.
Applied current strength and number of turns in the coil
【单选题】If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will _____.
A.
increase the capacity of the coil
B.
increase the superheat at the bulb
C.
deliver more refrigerant to the coil
D.
decrease the capacity of the coil
【单选题】精密称取供试品约0.5g,加冰醋酸与醋酐各10mL,加结晶紫指示剂1~2滴,用高氯酸滴定液(0.1mol/L)滴定,可用此法测定含量的药物是