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.
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C．42 gtts/min.
D．45 gtts/min.
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