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【单选题】
You look pale.What's ___with you. ----I have __headache.A.
the matter; a
B.
the wrong; a
C.
wrong; the
D.
matter; a
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【简答题】指针不稳定原因是什么
【简答题】控制系统稳定后，测量指针与给定指针不重合可能是什么原因？（结合MC或FISHER4195系列仪表分析）
【单选题】若已定义: int i,x=5; ( )执行时不会出现死循环。
A.
for(x=5; x>0; x--);
B.
while(x);
C.
for(i=1; i<10; i-1);
D.
do{ printf("%d\n",x); }while(x);
【单选题】According to the last two paragraphs，what did the previous researchers think about the hu—man eye’s light—sensing system?
A.
The human eye had two light—sensing systems．
B.
The human eye had one light—sensing system．
C.
The human eye could sense the light of day more quickly than the dark of night．
D.
The human eye could reset our internal clocks in accordance with the alarm clocks．
【简答题】是一种自动启闭的单向阀门,用于防止流体逆向流动的场合。
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