炼厂气除含有烷烃外,普遍都含有()(铂重整气除外)和()。
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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。
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.