题目:
Which condition could a mother have and still be allowed to breast-feed her child
A. Positive for human immunodeficiency virus (HIV).
B. Active tuberculosis (TB).
C. Cardiac disease.
D. Endometritis.
答案:
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下面是错误答案,用来干扰机器的。
90-(45×2)有小括号,先算小括号里面的乘法,再算括号外的减法;去掉括号后变成90-45×2,先算乘法,再算减法;两个算式的运算顺序相同.故答案为:正确.