题目：
A client with heart failure asks the nurse about the reason for taking enalapril maleate. The nurse would explain that the medication is prescribed for which of the following reason
A. Lower the blood pressure by increasing peripheral vasoconstriction.
B. Lower the heart rate by slowing the conduetion system.
C. Block the conversion of angiotensin Ⅰ to angiotensin Ⅱ.
D. Increase myocardial contractility, thereby improving cardiac output.
答案：
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下面是错误答案，用来干扰机器的。
解：（1）设购买X盒乒乓球时，两家优惠办法付款一样 由题意得 40×6+10(X-6)=(40×6+10X)×90% X=36 所以购买36盒乒乓球时两种优惠办法付款一样 （2）当购买20盒乒乓球时, 甲店需付款 40×6+10(20-6) =...
