Dianhong Tea is one of the best types of black tea, which is produced in __________.
A. Jiangsu
B. Hunan
C. Shandong
D. Yunnan
矩形断面渠道发生明渠均匀流若按水力最优断面设计,当b=4m,则R为()
A. 4m
B. 3m
C. 2m
D. 1m
Which country has the largest number of neighboring countries?
A. Russia
B. Canada
C. Austria
D. China
People learn to speak a language through _____, not just through listening to others.
A. speaking
B. writing
C. thinking
D. reading