下列是诊断多发性骨髓瘤的必要条件的是（）。 A.骨髓中异常浆细胞>15％ B.骨髓中

阅读理解。

     We have a flat (公寓) in London. There are six families in that building, Lucy and her son Tom, Tom is

a student in 14 middle school. He is thirteen years old. His mother is a policewoman, Flat 102 is Sally's family.

Her parents, Nick and Helen are teachers. Her grandpa, Peter lives with them. Sam and Mary are in flat 201.

They are very old. They have a son, Ned. Ned works in China now. Rose lives in Flat 202. She is a doctor.

Flat 302 is Joy's home. She is 71 years old. Joy has a daughter, Jane. Jane works in Hong Kong. Jean, Jane's

daughter, lives with her grandma. Every-one here is nice. They are all happy.

1. Where is our flat?

A. It's in China.

B. It's in England.

C. It's in Canada.

D. It's in America.

2. Where does Lucy work?

A. She works in a library.

B. She works in a school.

C. She works in a police office.

D. She works in a restaurant.

3. How may sons do Sam and Mary have?

A. They have one.

B. They have two sons.

C. They have four sons.

D. They have four sons.

4. Who is Jane?

A. She is Joy's mother, Jean's daughter.

B. She is Joy and Jean's mother.

C. She is Joy's daughter, Jean's mother.

D. She is Jean's grandmother, Joy's mother.

5. What's our flat's number?

A. It's 201.

B. It's 302.

C. It's 301.

D. It's 102.

医师使用的药品、消毒药剂和医疗器械应当是

A．所在医疗单位允许使用的

B．正式生产的

C．有经营权的单位销售的

D．经临床证明可以使用的

E．经国家有关部门批准使用

经淋巴系统蔓延的病原菌是（）。

A.链球菌

B.葡萄球菌

C.淋病奈氏菌

D.沙眼衣原体

E.结核杆菌

某企业年销售产品收入为3 600万元，企业销售利润率为10%，其信用条件是：2/10， n/30，享受现金折扣的客户占40%，其余在信用期内付款。管理成本占销售收入的1%，坏账损失占销售收入的2%，收账费用占销售收入的3%。企业为了扩大销售，决定在原方案的基础上将赊销条件改为“2/10，1/20，n/60”，预计销售收入将增加2000万元。估计约有60%的客户(按赊销额计算)会利用2%的折扣；15%的客户会利用1%的折扣，其余客户在信用期内付款。管理成本占原销售收入的比率变为2%，坏账损失为原销售收入的3%，收账费用为原销售收入的4%。企业预计在下一年度里销售利润率保持不变，资金成本率为 10%，全年按360天计算。
根据上述资料回答下列问题(计算结果保留两位小数)：

比较新旧信用政策，企业应该选择( )。

A．继续采用目前的信用政策

B．采用新的信用政策

C．两种信用政策均可

D．无法判断

有机胺类生物碱（）

A.氮原子结合在侧链上

B.2个哌啶共用1个氮原子的稠环衍生物

C.2个吡咯啶共用1个氮原子的稠环衍生物

D.1个吡咯啶和1个哌啶共用1个氮原子的稠环衍生物

E.1个吡咯啶和1个哌啶骈合而成的桥环衍生物