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【单选题】
关于心肌收缩的特点错误的是
A.
同步收缩（全或无式收缩）
B.
不发生强直收缩
C.
对细胞外钙离子的依赖性
D.
缺氧、酸中毒可使收缩力下降
E.
交感神经兴奋和儿茶酚胺浓度升高可使收缩力下降
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【单选题】39 The last paragraph suggests that future robots will
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