0÷□=0,□里能填任何数.______.
因为0做除数无意义,所以□里能填任何数是错误的;
故答案为:错误.
Almost all the houses in the city are said ________ in the terrible earthquake.
A.to destroy
B.having destroyed
C.to have been destroyed
D.to have destroyed
单人CPR时按压—通气比率为()
A.5:1
B.10:1
C.15
D.15:2
E.30:2