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【单选题】
下列哪项是预防溶血反应的措施A.
严格执行无菌操作
B.
输血前肌注异丙嗪
C.
做好血液质量检查
D.
输血前静注10%葡萄糖酸钙
E.
输血前静注地塞米松
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反馈参考答案：
举一反三
【单选题】The marginal benefit Claire gets from purchasing a third pair of flip-flops is
A.
the same as the total benefit of purchasing three pairs of flip-flops.
B.
more than the marginal cost of purchasing the third pair of flip-flops.
C.
the total benefit Claire gets from purchasing three pairs of flip-flops minus the total benefit she gets from purchasing two pairs of flip-flops.
D.
the total benefit Claire gets from purchasing four pairs of flip-flops minus the total benefit she gets from purchasing three pairs of flip-flops.
【单选题】For an edge-triggered D flip-flop, ( )
A.
a change in the state of the flip-flop can occur only at a clock pulse edge
B.
the state that the flip-flop goes to depends on the D input
C.
the output follows the input at each clock pulse
D.
all of these answers
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