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【单选题】
Refer to Figure 12. The circuit is used to derive a 60 Hz reference for a digital clock. After running for 24 hours the clock appears to be running 2 minutes and 18 seconds slow. What appears to be wrong with the circuit?A.
The error is very small and is to be expected of a circuit of this type; the clock should be regularly reset.
B.
The modulus of the counter has decreased, causing the counter to produce a lower output reference signal for the clock.
C.
The modulus of the counter has increased, causing a drop in the output frequency of the counter.
D.
The XTAL OSC is probably cooling off too much at night and consequently slowing down;the XTAL OSC should be temperature compensated.
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举一反三
【多选题】有关CH 50 检测说法正确的有（）。
A.
溶血素致敏的绵羊红细胞激活待测血清中的C
B.
溶血程度与补体含量量正相关
C.
溶血程度与补体含量呈负相关
D.
主要反映传统途径（C 9 ～C 9 ）活化的活性程度
E.
溶血程度与补体含量呈S形曲线关系
【多选题】有关CH50检测说法正确的有
A.
溶血素致敏的绵羊红细胞激活待测血清中的C3
B.
溶血程度与补体含量量正相关
C.
溶血程度与补体含量呈负相关
D.
主要反映传统途径(C1～C9)活化的活性程度
E.
溶血程度与补体含量呈S形曲线关系
【多选题】有关CH 50 检测说法正确的有（ ）
A.
溶血素致敏的绵羊红细胞激活待测血清中的C
B.
溶血程度与补体含量量正相关
C.
溶血程度与补体含量呈负相关
D.
主要反映传统途径（C 1 ～C 9 ）活化的活性程度
E.
溶血程度与补体含量呈S形曲线关系
【单选题】Japan’s growing sales of technology ________ a major development in this area, and we can also see its progress in other aspects.
A.
react
B.
defend
C.
represent
D.
settle
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