礼在周代的制度中大致上分为吉礼、凶礼、军礼、宾礼、嘉礼五种。
A. 正确
B. 错误
Aluminum pistons have () coefficient of thermal expansion compared with those of cast iron.
A. higher
B. lower
C. the same
D. none of the above
正常耳敏感指数为()。短增量敏感指数试验在耳蜗病变时,敏感指数可高达()。
A. 0%~20%
B. 20%~40%
C. 40%~60%
D. 60%~80%
E. 80%~100%