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【判断题】
声调是音节的高低升降的变化形式A.
正确
B.
错误
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举一反三
【简答题】指针不稳定原因是什么
【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．
【单选题】What did the researchers find in the experiment?
A.
Human walking used more energy than bipedal walking in chimps.
B.
One chimp used about the same energy in walking on two legs as on all fours.
C.
Two chimps used more energy walking on two legs.
D.
Three chimps used less energy walking on two legs.
【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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