题目内容

影响纺织材料介电系数的因素主要有()、()、()、()等。

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Which statements concerning the following code are true?() class a { public a() {} public a(int i) { this(); } } class b extends a { public boolean b(String msg) { return false; } } class c extends b { private c() { super(); } public c(String msg) { this(); } public c(int i) {} }

A. The code will fail to compile.
B. The constructor in a that takes an int as an argument will never be called as a result of constructing an object of class b or c.
Class c has three constructors.
D. Objects of class b cannot be constructed.
E. At most one of the constructors of each class is called as a result of constructing an object of class c.

某轧钢车间坯料断面为150mm×150mm,单重为0.60t,轧成φ32mm的圆钢,经测定其轧制节奏约为45s,求其轧机的小时产量是多少?(其中轧机利用系数k=0.9,成材率b=99%)。

什么是石油焦的挥发分?

鉴定支原体最特异敏感的试验是

A. 生长抑制试验(GIT)
B. ELISA试验
C. 补体结合试验
D. 免疫荧光试验
E. m凝试验

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