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【简答题】
（7分）实验室配制500mL0.1mol/L Na 2 CO 3 溶液回答下列问题 （1）需Na 2 CO 3 ·10H 2 O晶体____ ___g （2）现有以下仪器：①烧杯 ②250ml容量瓶 ③500ml容量瓶 ④量筒 ⑤玻璃棒 ⑥胶头滴管 ⑦托盘天平，配制Na 2 CO 3 溶液时需用的主要仪器有_________ ___。 （3）若实验遇下列情况，配得溶液的浓度是偏高，偏低还是无影响? A. 容量瓶内壁附有水珠而未干燥处理____________ 。 B. 溶解后没有冷却便进行______________ 。 C. 观察刻度时俯视_____________。
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皮皮学刷刷变学霸
举一反三
【判断题】The main vasoactive metabolites of coronary are adrenosine, lactate, and hypoxia.
A.
正确
B.
错误
【单选题】the structure of maintaining the high osmolarity in the renal medulla is
A.
vasa recta
B.
proximal tubule
C.
distal convuluted tubule
D.
Henle's loop
E.
collect duct
【单选题】What are the functions of secondary metabolites?
A.
Used to attract animals to pollinate the plant and to disperse its seeds
B.
Protecting the plant from herbivores such as insects
C.
Used to derive medicine
D.
All of the above
【简答题】How does the author explain the unidirectional flow of metabolites?
【单选题】the structure of maintaining the high osmolarity in the renal medulla is
A.
proximal tubule
B.
distal convuluted tubule
C.
Henle's loop
D.
vasa recta
E.
collect duct
【单选题】In the microcirculation, which of the following structures is mainly regulated by local metabolites?
A.
Arterioles
B.
Microvenous
C.
blood capillary
D.
Precapillary sphincter
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