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【单选题】
在摩擦起电现象中，造成物体带负电的原因是 [ ]A.
摩擦的速度快
B.
摩擦的速度慢
C.
该物体中原子核束缚电子的本领较强
D.
该物体中原子核束缚电子的本领较弱
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反馈参考答案：
举一反三
【单选题】When an injury occurs, which type of cells has the ability of recognizing microbes and necrotic cells and releasing mediators such as histamine that cause smooth muscle cells to relax?
A.
mast cells
B.
macrophages
C.
dendric cells
D.
basophils
【单选题】Which components are the source of serotonin which causes smooth muscle cells to contract?
A.
platelets
B.
lymphocytes
C.
monocytes
D.
basophils
【单选题】Slow waves in small intestinal smooth muscle cells are
A.
action potentials
B.
phasic contractions
C.
tonic contractions
D.
oscillating resting membrane potentials
E.
oscillating release of cholecystokinin(CCK)
【单选题】The ion base generated by the action potential of the smooth muscle cells of the digestive tract is（ ）
A.
K+ inflow
B.
Na+ inflow
C.
Ca2+ inflow
D.
Ca 2+ and K + inflow
【单选题】About the smooth muscle cells, which is wrong( )
A.
elongated fusiform cells
B.
mononuclear
C.
contain thick filaments, thin filaments and intermediate filaments
D.
without cross striations
E.
have myofibrils
【简答题】Smooth muscle cells are ____________, which means they don’t have stripes.
【简答题】预制桩打桩桩锤一般可分几类落锤、蒸汽锤、 和液压锤。
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