钢板水浸探伤中,如果入射角为(),在板中将会产生()。
参考答案:33°;横波
阅读短文,判断正(T)误(F)。
Dear friends,
I am Nancy. I am from America. I can speak Chinese. I like travelling best. I want to go to Australia
by plane. I send e-mails to my friends in Australia once a week.
( ) 1. Nancy is from America.
( ) 2. She can speak Chinese.
( ) 3. She wants to go to Australia by ship.
( ) 4. She sends e-mails to her friends twice a week.
莱克星顿枪声:华盛顿
A.萨拉热窝刺杀:斐迪南大公
B.多洛雷斯呼声:伊达尔哥
C.攻占巴士底狱:路易·波拿巴
D.《废奴宣言》发布:肯尼迪