联合卡环适用于()
A.单侧个别后牙缺失
B.单侧后牙游离缺失
C.前牙缺失
D.双侧后牙缺失
E.前后牙缺失
参考答案:B
解析:联合卡环适用于单侧后牙游离缺失。
下列现象不可用氧气的物理性质来解释的是 [ ]
A.海拔越高氧气的含量越少
B.氧气在降温加压时可变成淡蓝色的液体
C.氧气可使带火星的木条复燃
D.鱼类在水中生存说明水中溶有氧气
One advantage of price/sales (P/S) multiples over price to earnings (P/E) and price-to-book value (PBV) multiples is that :()
A. P/S can be used for distressed firms.
B. Regression shows a p relationship between stock prices and sales.
C. P/S is more volatile than P/E multiples and, therefore, more reliable for use in valuation.