问题
多选题
关于下列物质的性质及其应用，说法正确的是[ ]
A．LED是灯是新型节能灯，它的核心元件发光二极管是由半导体材料制成的
B．如果能把超导材料应用于实际，它可以用来制作电子元件
C．氢的热值很大，所以可以作为火箭的燃料
D．冷却汽车发动机用水是由于水的沸点高
答案
AC
搜题请搜索小程序“爱下问搜题”
关于下列物质的性质及其应用，说法正确的是[ ]
A．LED是灯是新型节能灯，它的核心元件发光二极管是由半导体材料制成的
B．如果能把超导材料应用于实际，它可以用来制作电子元件
C．氢的热值很大，所以可以作为火箭的燃料
D．冷却汽车发动机用水是由于水的沸点高
AC
Dear Sir/Madam, I am writing to 36 about the fat body of a(n) 37 I found in my ‘Vegetable Surprise’ last Thursday. It was 38 a surprise to me! A bad one, though. And even worse was that 39 when I realized only half of the white insect was left there on top of my green vegetables. I informed the 40 of my problem and I did not expect him to 41 and tell me that insects were a good source of protein. I am a vegetarian! In fact, I have eaten in your restaurant many times 42 and this is the first time I have been 43 . And I do not feel we should have been 44 for this meal, so I would ask you to 45 the cost. I await your reply. Yours faithfully, Mr. John Smith
|