容器常见的失效模式有1._______________；2.______________；3._____________；4.______________；5._______________；6.______________；7.______________；8.______________。

压力容器有十种设计准则，它们分别是：1.______________；2._____________； 3._____________；4.________________；5._______________；6.________________；7._______________；8.______________；9._____________；10._______________;

Watch the interview with Audrey Hepburn and complete the short passage by filling the blanks with only one word.When coming up to the plea thatAudrey Hepburn wants to make the public, she says she hopes that people will understand that once again there's a 1. _____________ in Africa which is potentially much 2._____________ than last time. 3.______________ is everywhere helping them and it tends to give people a spade to dig their water 4._____________, but not the 5._______________ for their children.

【单选题】要指定一个绝对位置 5 , 5 的点,应该输入: () @5 , 5 5 》 5 5 , 5 5<5< span=""> A. @5，5 B. 5》5 C. 5，5 D. 5<5

根据乘方的意义可知：53=5×5×5，54=5×5×5×5，则53×54=（5×5×5）×（5×5×5×5）=57即53×54=57。想一想：

【单选题】下面程序执行结果() #include main() { int i ,j ; for(i=1; i<=5; i++) { for(j=1; j<=i; j++) printf("%2d",i); printf(" ",); } } A. 1 2 2 3 3 3 4 4 4 4 5 5 5 5 5 B. 1 2 3 4 5 C. 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D. 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5

5^2 5^3=5^5

【单选题】5 A. 5 B. 5 C. 5 D. 5

5<>5与5!=5结果相同

能正确表示数学关系：“[img=90x21]18031a61b498c1c.png[/img]”的C语言表达式是（ ）。 A: a>=-5 and a<=5 B: a>=-5 or a<=5 C: a>=-5 && a<=5 D: a>=-5 || a<=5