题目内容

已知 int x=10, y=20, z=30; 以下语句执行后，x ,y ,z 的值是_____。if(x>y)z = x;x = y;y = z;

A.x = 10, y = 20, z = 30
B. x= 20, y = 30, z = 30
C.x =20, y=30, z = 10
D. x = 20, y = 30, z = 20

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如果将两只额定值为220V/100W的白炽灯串联接在220V的电源上,每只灯消耗的功率为?(设灯电阻不变)

A. 100
B. 50
C. 25
D. 200

一220V/55W的白炽灯,接在110V的电源上,其工作电流为( )。

A. 1A
B. 0.5A
C. 0.25A
D. 0.125A

电源电动势的方向规定为在电源内部由电位端指向电位端。

Have you ever used email to apologize to a colleague? Delivered a 1_ to a subordinate (下属) with a voice-mail message? Flown by plane across the country just to deliver important news in person? The various communication options at our fingertips today can be good for 2 and productivity—and at the same time very troublesome. With so many ways to communicate, how should a manager choose the one that's best— 3 when the message to be delivered is bad or unwelcome news for the recipient? We've 4 business communication consultants and etiquette (礼仪) experts to come up with the following guidelines for 5 using the alternative ways of delivering difficult messages. First of all, choose how personal you want to be. A face-to-face communication is the most 6 . Other choices, in descending order of personalization, are: a real-time phone call, a voice-mail message, a handwritten note, a typewritten letter, and the most 7 is email. Some of these may change order according to the 8 situation or your own preferences; for example, a handwritten note might seem more personal than voice-mail. How do you decide on the best choice for the difficult message you've got to deliver? “My 9 concern is: How can I soften or civilize this message?” says etiquette expert Dana Casperson. “So when I apologize, I usually choose in-person first, or a phone conversation as my top alternative, and maybe a handwritten note next. Apologizing by email is something I now totally 10____ .”A) avoid B) convenience C) effectively D) escape E) intimateF) particularly G) primary H) prompt I) reward J)silentK) specific L) surveyed M) unfriendly N) warning O) witnessed