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【多选题】
对于主函数 main 的描述，以下正确的有哪几个？A.
一个C语言有且仅有一个main函数。
B.
main函数也可以被其它函数调用。
C.
程序总是从main函数开始执行，到main函数结束。
D.
main函数必须放在所有函数前面。
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反馈参考答案：
举一反三
【单选题】量化过程中,量化等级数量越多,间隔越小,则()
A.
量化后误差越小,信号失真越小
B.
.量化后误差越大,信号失真越小
C.
.量化后误差越大,信号失真越大
D.
.量化后误差越小,信号失真越大
【多选题】常见的路面材料包括
A.
沥青
B.
混泥土
C.
石（水洗石、小料石、卵石、花岗岩、板岩）
D.
砖（粘土砖、花砖、透水砖）
E.
砂土
F.
木（木屑、木栈道、塑木）
G.
瓦
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