较先进的外科手术器械包括：（）
A.高频电刀
B.冷冻手术装置
C.显微外科设备
D.骨肠道吻合器
E.激光治疗
参考答案：A, B, C, D, E
A residential apartment block in New York has 20 apartments of 1000 square foot area each. The monthly rental per apartment is $5000. The vacancy rate is 10% , and average collection losses are 2%. Operating expenses are $10000 per month (fixed expenses not depending on occupancy). The risk free rate and cap rate are 5% and 10% respectively. The value of the property using the NOI approach is closest to:（）
A. $9.36 mil.
B. $9.38 mil.
C. $6.24 mil.
属于二类压力容器的是（）。
A.中压容器
B.高压容器
C.非易燃和无毒介质的低压容器
D.低压管壳式换热器
