问题
单项选择题
国家标准规定，硅酸盐水泥的初凝时间不得小于（）。
A.30min
B.35min
C.45min
答案
参考答案：C
搜题请搜索小程序“爱下问搜题”
国家标准规定，硅酸盐水泥的初凝时间不得小于（）。
A.30min
B.35min
C.45min
参考答案：C
Do you know? There is one language ____ in every country in the world. People, young or old, short or tall, thin or fat, use it very often. It is everybody’s second ____ . It is very easy to ___, though you can’t hear it. It is a sign language. When you wave(挥手) to a friend on the street, you are ____sign language. When you ___ up your hand in class, you are saying, “Please ask me, I think I know the answer,” or “I have some questions to ____.” When you smile at someone, you mean to be ____to him. When you put your forefinger(食指) in front of your mouth, you mean, “___ quiet, please.” When a policeman wants to ___cars or buses, he raises his right arm. Sign language is very useful in quiet places or places ___ of noise. It is different from body language.
|