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【单选题】
安全色是表达安全信息含义的，国家规定的安全色有（）四种颜色。A.
红、绿、黑、白
B.
红、兰、紫、黄
C.
红、蓝、黄、绿
D.
绿、红、黄、黑
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A.
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B.
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C.
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D.
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【单选题】当执行以下程序时,________。 #include void main() { int a; while(a=5) printf("%d ",a--); }
A.
循环体将执行5次
B.
循环体将执行0次
C.
循环体将执行无限次
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