有机物A的分子式为C6H12O2，在一定条件下发生如下转化关系，且D和E都不能发

属于细胞周期非特异性抗癌药物的是（）。

A.氮芥

B.白花蛇舌草

C.己烯雌酚

D.长春新碱

E.5-FU

城市维护建设税的税率，一般按（）的适用税率执行。

A.纳税人总机构所在地

B.纳税人缴纳三税所在地

C.纳税人的生产经营地

D.纳税人所在地

When the system upon which a transport entity is running fails and subsequently reatarts, the ______ information of all active connections is lost. The affected connections become half-open, as the side that did not fail does not yet realize the promble.
The still active side of a half-open connections using a ______ timer. This timermeasures the time transport machine will continue to await an ______ of a transmitted segment after the segment has been retransmitted the maximum number of times. When the timer ______, the transport entity assumes that either the other transport entity or the intervening network has failed. As a result, the timer closes the connection, and signals an abnormal close to the TS user.
In the event that a transport entity fails and quickly restart, half-open connections can be teminated more quickly by the use of the RST segment. The failed side returns an RST_i to every segment i that it receives. When the RST_i reaches the other side, it must be checked for validity dased on the ______ number i, as the RST could be in response to an old segment .If the reset is valid, the transport entity performs an abnormal termination.

A. expires B. restarts C. stops D. abandons

下列排水横管的布置敷设正确的是（）。

A.排水横支管可长可短，尽量少转弯

B.横支管可以穿过沉降缝、烟道、风道

C.横支管可以穿过有特殊卫生要求的生产厂房

D.横支管不得布置在遇水易引起燃烧、爆炸或损坏的原料、产品和设备上面

外商投资租赁公司的监管由（）负责