When using a two-point calibration method to correct pH on a pH meter, if the test solution is acidic, the appropriate standard buffer solution should be（）

A . be shielded from direct sunlight B . be locked into a constant heading C . have any air bubbles replaced with nitrogen D . have the compensating magnets removed

A . Channel 6 DSC B . Channel 6 Radiotelephony C . Channel 13 Radiotelephony and channel 16 DSC D . Channel 70 DSC

A .  j_login B .  j_get_user C .  j_login_check D .  j_get_security E .  j_security_check

A . five to seven times the depth of water B . seven to ten times the depth of water C . twice the depth of water D . twice the depth of water plus the range of tide

A . When the filesystem will contain 100GB files. B . When the filesystem resides on a 32-bit system. C . When the filesystem contains a large number of small files. D . When filesystem compression is required due to limited disk space.

A . A bowline knot B . A long splice C . An overhand knot with a wire rope clip D . Wire rope clips with a thimble eye

A . tumble home B . excessive deadrise C . excessive trim D . a list

A . #6 solid copper B . #12 solid copper C . #20 solid copper D . #22 solid copper

A . is easy to connect B . provides an effective catenary and absorbs shock due to its weight C . makes rigging a swivel unnecessary D . prevents the tow from yawing by the drag of the chains in a seaway

A . when anchoring in the Mediterranean B . when docking stern to a berth C . when docking bow to a berth D . when anchoring in a strong current

A . By using active / passive teaming with spanning tree on the active link B . By using active / passive teaming with only the active link in use C . By using active / active teaming with VM utilizing both uplink port

A . guide the bosun's chair down a stay when applying a protective coating B . run paint or tools up to a sailor in a chair with a heaving line C . keep a bosun's chair from swinging with the ship's motion D . reeve the gantline through

A、a straight line drawn on the chart approximates a great circle B、the chart should not be used outside of the standard parallels C、the course angle is measured at the mid-longitude of the track line D、Distance cannot be measured directly from the chart

A . It makes for an easy connection B . It gives a spring effect to cushion the shock C . It eliminates the necessity of a swivel D . It does not chafe

A . Gantline B . Heaving line C . Preventer D . War

A . By using active / passive teaming with spanning tree on the active Iink B . By using active / passive teaming with onIy the active Iink in use C . By using active / activate teaming with VM utilizing both uplink port

A . center bearings B . tangent bearings C . ranges D . objects that are close aboard

A . shipping jurisdictions for each fulfillment center B . shipping codes for each set of shipping charges to be applied to products C . shipping methods for each carrier and service offered by the carrier D . shipping zones for each geographical region where goods will be shipped

A．very cold water B．cold water C．warm water D．very hot water

是 否

A、you want to say goodbye to someone B、you want to thank someone C、you want to greet someone D、you want to apologize to someone