In using Loran-C，skywave reception gives greater range but is（）.

A . lapped construction B . strapped construction C . joggled construction D . belted constructio

A . for precise navigation in coastal waters B . by measuring the phase difference of the dots and dashes C . as an aid to ocean navigation D . if the vessel is fitted with a special Consol receiver

A . stores liquid refrigerant B . collects non-condensable gases C . allows refrigerant sub-cooling D . prevents compressor surging

A . Reflected electron B . Electrical radiation C . Quarterpoint electrical navigation D . Hyperbolic radio navigatio

A . In fact B . For example C . Besides D . Because of thi

A . to uniquely identify the archived log files with the restore operation B . to uniquely identify the archived log files with the redo log group number C . to uniquely identify the archived log files for each incarnation of the database D . to uniquely identify the archived log files with the number of recovery operations performed

A . good B . bad C . careless D . inadequate

A . passing a tow bridle to the tug B . passing a messenger line C . heaving in the tow bridle D . service lines with rocket line thrower

A . Position of the tongue B . Shape of lips C . Openness of the mouth D . Openness of the vocal cords

A . to prevent multicast packets from looping B . to prevent PIM packets from looping C . to instruct PIM where to send a （*， G） or （S， G） join message D . to prevent multicast packets from looping and to instruct PIM where to send a （*， G） or （S， G） joinmessage

A . covering wire or fiber rope B . forcing fids into a line C . dogging hatches D . splicing line

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 . Skip zone B . Blackout zone C . Diffraction zone D . Shadow zone

A . protect the towline from chafing B . secure the end of the towline on the tug C . stop off the towline while retrieving it D . absorb shock loading on the towline

A . hoisting cargo aboard a vessel B . hoisting personnel aboard a vessel C . securing a small boat to a large vessel D . hoisting the anchor

A．Right. B．Wrong. C．Doesn't say.