【单选题】Jain和White于1977年提出了( )。
【简答题】三相半波整流电路阻性负载移相范围是( )度
【单选题】Which statement is correct regarding the operation of DHCP?
B.
A DHCP client uses a ping to detect address conflicts.
D.
A DHCP server uses a gratuitous ARP to detect DHCP clients.
F.
A DHCP client uses a gratuitous ARP to detect a DHCP server.
H.
If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
I.
检测到地址冲突,则从地址池中删除该地址,管理员必须解决冲突。
J.
If an address conflict is detected, the address removed from the pool for an amount of time K. nfigurable by the administrator. L. 检测到地址冲突,则将该地址从地址池中删除一段时间,然后由管理员重新配置该地址。
【单选题】以下哪项不属于行政合理性原则的具体内容( )
【单选题】{.XZ}是根据可燃物质发生燃烧时必须达到一定的温度这个条件,将灭火剂直接喷洒在燃烧的物体上,使可燃物的温度降低到燃点以下从而使燃烧停止
【单选题】1935年Danielli和Davson提出了第一个细胞膜分子结构模型( )。
【单选题】20世纪50年代末,Robertson提出了( )。
【单选题】Which statement explains why the boiling point of methane is higher than that of neon?
A.
r : H, 1; C, 12; Ne, 20]
B.
A molecule of methane has a greater mass than a molecule of neon.
C.
Molecules of methane form hydrogen bonds, but those of neon do not.
D.
Molecules of methane have stronger intermolecular forces than those of neon.
E.
The molecule of methane is polar, but that of neon is not.
【单选题】下列对类的声明,正确的是( ) B
A.
abstract final class Hh{…}
B.
abstract private move(){…}
C.
protected private number
D.
public abstract class Car{…}