The use of sinking and dispersing chemical agents for removal of surface oil is（）.

A .  vmtune -N4 -M80 B .  vmtune -f4 -F80 C .  vmtune -l4 -L80 D .  vmtune -p4 -P80

A . FTP B . SMTP C . Telnet D . DNS E . All of the above

A . Switches take less time to process frames than hubs take. B . Switches do not forward broadcasts. C . Hubs can filter frames. D . Using hubs can increase the amount of bandwidth available to hosts. E . Switches increase the number of collision domains in the network.

A . fuel/water separators B . day tanks C . injector test stand D . fuel filter

A .  netpmon B .  netstat C .  nfsstat D .  vmstat

A .  IPAT via IP aliasing B .  Custom Resource Groups C .  Heartbeating over IP Aliases D .  Concurrent Capable Volume Grou

A . cylinder covers B . lubricating space C . crosshead D . exhaust manifold

A . strips of burlap B . heavy paper C . dunnage boards D . strips of rope yar

A . SMTP B . Telnet C . FTP D . DNS

A . general plans B . builder's documentation C . Certificate of Inspection D . construction portfolio

A . the most common method used in the United States B . too expensive for common use C . generally safe to sea life D . generally harmful to sea life

A . High frequency pulses B . Combinations of high and low frequency pulses C . The same frequency for all stations in a chain D . Varied long and short pulse

A . Mention signal stations and ice，storm，traffic and port signals B . Give the international numbers of lights C . Give the correction of the lights and fog signals D . Give the information on the lights and fog signal

A . Constraints provide data independence. B . Constraints make complex queries easy. C . Constraints enforce rules at the view level. D . Constraints enforce rules at the table level. E . Constraints prevent the deletion of a table if there are dependencies. F . Constraints prevent the deletion of an index if there are dependencies.

此题为多项选择题。

To get a hand in is to begin a job, to begin to know something about it. When we learned completely, it will be easy for us. We will be able to do it hands down. If we do the job well, we may end up with the upper hand. That means to be in control or to have gained complete understanding of a situation. On the other hand, if the situation gets out of hand then, it is out of control. Then we may have to hand it to someone, to let someone else take over the business. It is time for us to wash our hands, to end it up completely. You can also lend a hand to someone but without really giving up your hand. You lend a hand when you help someone. You offer them a helping hand. If someone is kind enough to lend us a hand then we surely do not want to bite the hand that feeds us. We do not want to repay his kindness by treating him badly. The expression "to end up with the upper hand" means ______. A．to begin a job B．to be in control C．to be out of control D．to take over the business

To get a hand in is to begin a job, to begin to know something about it. When we learned completely, it will be easy for us. We will be able to do it hands down. If we do the job well, we may end up with the upper hand. That means to be in control or to have gained complete understanding of a situation. On the other hand, if the situation gets out of hand then, it is out of control. Then we may have to hand it to someone, to let some- one else take over the business. It is time for us to wash our hands, to end it up completely. You can also lend a hand to someone but without really giving up your hand. You lend a hand when you help someone. You offer them a helping hand. If someone is kind enough to lend us a hand then we surely do not want to bite the hand that feeds us. We do not want to repay his kindness by treating him badly. The expression "to end up with the upper hand" means ______. A．to begin a job B．to be in control C．to be out of control D．to take over the business

A、whereas B、but C、while D、though

A．sodium dodecyl sulfate （SDS） B．ammonium sulfate C．ferric phosphate D．phenol