A、affects the threshold of action potential
B、is not necessarily accompanied by contraction of smooth muscle
C、affects the frequency of smooth muscle contraction
D、affects the intensity of smooth muscle contraction
A、affects the threshold of action potential
B、is not necessarily accompanied by contraction of smooth muscle
C、affects the frequency of smooth muscle contraction
D、affects the intensity of smooth muscle contraction
A、It doesn’t matter
B、You’re welcome
C、You’re kind
D、I don’t think so
A、Your position in the lecture theatre.
B、The lecturer's use of voice language.
C、The lecturer's use of body language.
D、Lecture language.
用色谱法分离Fe3+,Co2+,Ni2+。以正丁醇-丙酮-浓HCl为展开剂,若展开剂的前沿与原点的距离为13cm,斑点中心与原点的距离为5.2cm,则Co2+的比移值Rf为多少?
取100.0mL水样,经过阳离子交换树脂后,Ca2+和Mg2+被交换至树脂上,流出液用0.1000mol·L-1的NaOH标准溶液滴定,用去10.00mL,试计算试样中水的硬度。
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