题目:
下列命题中: ①若a与b互为相反向量,则a+b=0; ②若k为实数,且k•a=0,则a=0或k=0; ③若a•b=0,则a=0或b=0; ④若a与b为平行的向量,则a•b=|a||b|; ⑤若|a|=1,则a=±1. 其中假命题的个数为( )
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答案:
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参考答案:D解析:Hypocalcemia is a major potential complication of pancreatitis. Muscle twitching and irritability are primary symptoms of hypocaleemia. Calcium replacement must begin as soon as hypocalcemia is validated.