单项选择题

A．A
B．B
C．C
D．D

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class Tank { int level;} public class TestTank { public static void main(String[] args) { Tank t1 = new Tank(); Tank t2 = new Tank(); t1.level = 9; t2.level = 47; System.out.println("1: t1.level: " + t1.level + ", t2.level: " + t2.level); t1 = t2; System.out.println("2: t1.level: " + t1.level + ", t2.level: " + t2.level); t1.level = 27; System.out.println("3: t1.level: " + t1.level + ", t2.level: " + t2.level); }}

答案： 1: t1.level: 9, t2.level: 472: t1.level: 47, t2.level: 473: ...

单项选择题

一悬臂梁承受均布荷载的q作用。若已知应力分量为
。
试证明：当无体力时，所给的应力分量满足相容方程。