问题
单项选择题
对横向分辨力最直接的影响因素是()
A.声波的频率
B.声波的波长
C.穿透深度
D.声束的宽度
E.声束入射的角度
答案
参考答案:D
对横向分辨力最直接的影响因素是()
A.声波的频率
B.声波的波长
C.穿透深度
D.声束的宽度
E.声束入射的角度
参考答案:D
Hi Jerry, Thank you 1 your invitation to 2 your school next week. I am sorry I 3 come. I’m not going to be 4 next week. On Monday, I have a piano lesson 5 8:00 5 10:00 in the morning, and I have to study for the English test in the afternoon. On Tuesday, I am 6 a friend from my hometown at the airport. On Wednesday, I am 7 tennis with my friends. I have to look after my 8 grandpa on Thursday. On Friday, I’m helping one of my classmates 9 his English. I am busy 10 week.
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