Since using Facebood Ads, we've seen a ____ increase in traffic to our website.
A. 6.9%
B. 8.6%
C. 6.8%
D. 9.6%
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The Mariana Trench is _____ meters deep, or ____ feet.
A. 10,994; 36,070
B. 10,994; 36,700
C. 10,794; 36,070
D. 10,794; 36,700
The average human head contains about ____ hair follicles.
A. 100
B. 1000
C. 10,000
D. 100,000
在波长为λ的驻波中,两个相邻波腹或相邻波节之间的距离为()
A. λ/4
B. λ/2
C. 3λ/4
D. λ