有以下计算公式：若程序前面已在命令行中包含math.h文件，不能够_爱下问搜题

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问题单项选择题

有以下计算公式：

若程序前面已在命令行中包含math.h文件，不能够计算上述公式的程序段是（）

A．y=sqrt(x);

if(x＜0)y=sqrt(-x);

B．if(x＞0)y=sqrt(x);

else y=sqrt(-x);

C．if(x＞=0)y=sqrt(x);

if(x＜0)y=sqrt(-x);

D．y=sqrt(x＞=0x:-x);

答案

参考答案：A

解析：

应该先判断x是正数还是负数，然后再调用sqrt函数，A选项开始没有判断，所以A错误。

完形填空

I arrived in the United States on February 6, 1997, but I remember my first day there very clearly. My friend was waiting for me when my plane____26____at Kennedy Airport at three o’clock in the afternoon. The weather was very cold and it was snowing, but I was_____27____
excited to mind. From the airport, my friend and I ______28_____a taxi to my hotel. On the way, I saw the skyline of Manhattan for the first time and I stared_____29_____astonishment at the famous skyscrapers and their_____30_____beauty. My friend helped me unpack at the hotel and then_____31____me because he_____32_____go back to work. He_____33_____to return the next day.
______34____ my friend had left, I went to a restaurant near the hotel to get something to eat. Because I_____35____speak a word of English, I couldn’t ____36____the waiter what I wanted. I was very upset and ____37_____to make some gestures, _____38_____the waiter didn’t understand me. Finally, I______39_____the same thing the man_____40_____the next table was eating. After dinner, I started to walk along Broadway______41_____I came to Time Square with its movie theatres, and huge_____42_____people. I didn’t feel tired so I continued to walk_______43_____the city.
When I returned to the hotel, I couldn’t sleep because I ______44______hearing the fire and police sirens(汽笛) during the night. I______45_____awake and thought about New York. I decided that I had to learn to speak English.

B．would leave

D．was leaving

A．Shortly after

B．Long before

单项选择题

与一般项目管理相同或相似，服务项目管理主要涉及( )个知识与职能领域。

A．6

B．7

C．8

D．9