已知复数z=3+4i且z(t-i)是实数,则实数t等于( )
A:34
B:43
C:-34
D:-43
—The land in the southwest of China is in great need of .—Yes, it hasn't rained for a long time there.
食品防腐保鲜的方法可以选择填充气体、放置干燥剂、添加防腐剂等.