8个25的和与50×4的积相等.…______.
25×8=200,
50×4=200;
所以8个25的和与50×4的积相等.
故判断为:√.
What do you like to do _____ such a windy day? .. [ ]
A. at
B. on
C. down
D. in
试述破伤风的治疗原则。