心肌细胞内的Ca2+贮存在()
A.肌浆内
B.肌浆网内
C.线粒体内
D.横小管内
E.心肌细胞外
参考答案:B
解析:肌浆网膜上有钙泵蛋白,可调节肌浆中钙离子的浓度。
---Can you tell me ______________?
---His home is quite far away from the office, I think.
A.when he got up
B.where he works
C.why he bought the car
D.how he likes his job,
在与大主应力面成α=45°的平面上剪应力最大,故该平面总是首先发生剪切破坏。