题目内容

在电源频率不变的情况下,三相感应电动机的转矩和()成正比。

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抽象图案分为规律性几何图案、殊性几何图案、()性几何图案。

影响纺织材料介电系数的因素主要有()、()、()、()等。

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%)。

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