Which are valid identifiers？（）  

A . 169.254.23.59 B . 223.254.255.254 C . 225.1.1.1 D . 227.43.34.2 E . 238.3.3.3 F . 249.1.2.3

A . Magic  B . Plain  C . Check  D . List item  E . Divider

A . CASCADE B . UNIQUE C . NONUNIQUE D . CHECK E . PRIMARY KEY F . CONSTANT G . NOT NULL

A . It checks the database for intrablock corruptions. B . It can detect corrupt pfiles. C . It can detect corrupt spfiles. D . It checks the database for interblock corruptions. E . It can detect corrupt block change tracking files.

A .  $persons B .  TwoUsers C .  *point D .  this E .  _endline

A . <%! int i； %> B . <%= int i； %> C . <jsp：expr>int i；</jsp：expr> D . <jsp：scriptlet>int i；</jsp：scriptlet> E . <jsp：declaration>int i；</jsp：declaration&gt

A . IPCC Express communicating with the ICM via a standalone IPCC Gateway PG running on an expansion server   B . IPCC Express communicating with the ICM via a co-resident IPCC Gateway PG C . IPCC Express using the IPCC Enterprise Outbound option   D . IPCC Express using the IPCC Enterprise CTI-OS Toolkit   E . IP IVR integrating with IPCC Enterprise to function as queue point and self-service platform

A .  false B .  default C .  _object D .  a-cla

A . PPP B . WAP C . HDLC D . MPLS E . L2TPv3 F . ATM

A . LDP hello packets are sent to UDP port 646 B . LDP hello packets are sent to TCP port 711 C . LDP sessions are TCP sessions to port 646 D . LDP sessions are TCP sessions to port 711 E . LDP establishes a peer relationship with another router that must be directly attached F . LDP can establishes a peer relationship with another router that is not directly attached

A .  false B .  default C .  _object D .  a-cla

A . High Availability CRS Engines running on hardware from different server classes  B . High Availability CRS Engines running on similar hardware from the same server class but from different vendors  C . High Availability CRS Engines and database and a simplex Recording Server  D . High Availability CRS Engines and four simplex VoIP Monitoring Servers  E . CCM co-resident deployment on an MCS 7815

A . PPP B . WAP C . DSL D . Ethernet E . L2TPv3

A .  false B .  default C .  _object D .  a-cla

A . Has a maximum hop count of 25 B . Can differentiate between internal and external routes C . Uses a 32-bit metric D . Can maintain only one routing table E . Need all networks to use the same subnet mask F . Supports only one routed protocol

A .  Float foo = -1； B .  Float foo = 1.0； C .  Float foo = 42e1； D .  Float foo = 2.02f； E .  Float foo = 3.03d； F .  Float foo = 0x0123；

A .  void methoda（）； B .  public double methoda（）； C .  public final double methoda（）； D .  static void methoda（double d1）； E .  protected void methoda（double d1）；

A .  float foo = -1； B .  float foo = 1.0； C .  float foo = 42el： D .  float foo = 2.02f： E .  float foo = 3.03d：

A . NAT B . VPN C . STP D . Security Audit

A .https://assets.asklib.com/images/image2/2018073115112695987.jpg B .https://assets.asklib.com/images/image2/2018073115114664903.jpg C .https://assets.asklib.com/images/image2/2018073115123688801.jpg D .https://assets.asklib.com/images/image2/2018073115124427624.jpg E .https://assets.asklib.com/images/image2/2018073115125392737.jpg

A .https://assets.asklib.com/images/image2/2018073110210939625.png B .https://assets.asklib.com/images/image2/2018073110211734462.png C .https://assets.asklib.com/images/image2/2018073110213254511.png D .https://assets.asklib.com/images/image2/2018073110214023955.png

A .  SCN B .  Timestamp C .  Named recovery point D .  Transaction ID E .  Session ID

A .  Source and destination interface must be on the same host B .  Source and destination interfaces can be on different hosts C .  Destination vEthernet interface can be on a different VLAN than the source D .  Destination interface can be a physical port E .  Destination interface cannot be a physical port

A .  float f = 1F； B .  float f = 1.0.； C .  float f = ‘1’； D .  float f = “1”； E .  float f = 1.0d；