油船应急计划中的初步行动中，首先发现灾情的人一定要先发警报，并向（）报告出事地点。
A、船长
B、大副
C、值班等船员
D、指定负责人
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（1）三角形内角和等于 ．
（2）请证明以上命题．
在一个正五边形花台的周围摆上盆花，要使每条边上都有五盆花，至少需要准备______盆花．
We were driving along the village of Simdara. I 36 to my right and saw an old shelter 20 meters from the side of the road that appeared to be filled with 37 . “Would you mind 38 ?” I asked the driver Waris. “I think there is a(n) 39 .” Waris laughed. “No, Greg, that’s actually a public toilet,” explained Waris and he kept 40 . “But why are there so many kids? What are they doing there? We need to 41 ,” I insisted. The word caught Waris 42 and he stopped the car. When we reached the shelter, to my surprise, it was 43 a toilet—or at least it had been at one time. The roof was gone now, and the four toilet pits (坑) had been 44 with old boards. There were 25 children between 4 and 5 years old, one 45 , and a wooden board against the wall. Though having a tough learning environment, the students are quite 46 to chat with us about their class and curriculum (课程). After about ten minutes, the teacher 47 if we might like to see “the rest of the school”. We 48 and followed her up the hill. Just over the top of the hill, there was an old tent. It was very 49 inside because nearly 100 students were packed like sardines (沙丁鱼). These students were a little 50 , fourth-, and sixth-graders, and all of them were sitting on the ground. 51 the teacher, they were doing extremely well — 52 most of them had no books, paper or even pencils. We were forced to 53 to catch our plane. We were all 54 and decided to collect money to build a school for these children who had a hunger for 55 .
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TK981型应急电源采用双路电压输出电路，三相整流电路给负载提供（）供电电压。
A.DC12V
B.DC24V
C.DC48V
D.DC110V
问卷法的优点包括( )
A．可以面面俱到，在短时间内收集大量信息
B．比较规范化、数量化、适合于用计算机对结果进行统计分析
C．可以收集到准确规范、含义清晰的工作信息
D．成本低
E．可以直接与被调查者进行双向交流