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【判断题】
利用仪器、仪表来检测机器参数，从而确定机器的技术状态，称为主观 诊断法A.
正确
B.
错误
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【单选题】若有如下程序： #include＜iostream＞ using namespace std； int s=O； class sample { static int n； public： sample(int i) { n=i; } static void add() { s+=n； } }； int sample::s=0； int main() { sample a(2)，b(5)； samp...
A.
2
B.
5
C.
7
D.
3
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