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【简答题】
如何选择酶和细胞的固定化载体?
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【简答题】样本98, 100 , 98 , 100 , 101 , 103 的样本平均数为( ),的样本方差为( )
【单选题】心肺复苏的操作流程正确的是（）
A.
意识水平判断→开放气道→人工呼吸→心外按压
B.
意识水平判断→开放气道→心外按压→人工呼吸
C.
开放气道→意识水平判断→人工呼吸→心外按压
D.
开放气道→意识水平判断→心外按压→人工呼吸
【简答题】请写出心肺复苏的操作流程。
【简答题】Signals received from satellite can help gather data.
【单选题】Signals can be ________.
A.
digital
B.
analog
C.
either digital or analog
D.
neither digital nor analog
【简答题】样本98,100,98,100,101,103的样本平均数为( ),样本方差为( )。
【多选题】How can extracellular signals regulate the permeability of gap junctions?
A.
Gap junctions in many tissues can be opened or closed in response to extracellular or intracellular signals.
B.
The neurotransmitter dopamine, for example, reduces gap-junction communication between certain neurons in the mammalian retina when secreted in response to an increase in light intensity.
C.
This reduction in gap-junction permeability alters the pattern of electrical signaling and helps the retina switch from using rod photoreceptors, which are good detectors of low light levels, to cone photoreceptors, which detect color and fine detail in bright light.
D.
Gap junctions are dynamic structures that, like conventional ion channels, are gated: they can close by a reversible conformational change in response to extracellular or intracellular sign als . The permeability of gap junctions decreases within seconds, for example, when the intracellular Ca 2+ concentration is raised.
【简答题】已知一个样本：98，99，100，101，102．那么这个样本的方差是______．
【单选题】Computers can only recognize( )signals.
A.
analog
B.
infrared ray
C.
light
D.
digital
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