Advection fog holds longest over which portions of the lakes? （）

A . A．0.5～5nmile B . B．小于0.5nmile C . C．小于2nmile D . D．2～5nmile

A . spring B . later winter C . autumn D . end of summer

A . Is 50% water saturated B . Is 90% water saturated C . Temperature is greater than the dew point temperature D . Temperature is equal to，or below the dew point temperature

A . has a spray pattern 12 feet in diameter B . can be used in conjunction with both 1-1/2 inch and 2-1/2 inch all-purpose nozzles C . has a 90°bend at its discharge end D . has a screw thread end which connects to the all-purpose nozzle

A . conduction fog B . radiation fog C . frontal fog D . advection fog

A . 风 B . 空气的水平运动并伴有某种物理量的输送 C . A.B都对 D . A.B都错

A . A barometer B . An anemometer C . A sling psychrometer D . A pyrometer

A . colder sea surface B . warmer sea surface C . dry coastal plains D . high mountain or plateau

A . station the look-out in the wheelhouse to keep a continuous watch on the radar B . secure the sounding of fog signals until a vessel closes within five miles C . station a look-out as low down and far forward as possible D . keep the radar on the shortest available range for early detection of approaching vessel

A . close B . open C . switch off D . switch o

A . warm front at night B . low pressure area C . anticyclone D . lack of frontal activity

A . switch on B . switch off C . close D . ope

A . to be sailing B . sailing C . sail D . to sail

A . A．大风警报 B . B．一般警报 C . C．浓雾警报 D . D．风暴警报

A . to B . at C . in D . into

A . A．＜0.1km B . B．＜1km C . C．＞1km，＜10km D . D．＜10km

A . is a finer，more diffuse water spray than low-velocity fog B . requires that the water pressure be no greater than 60 psi C . produces an effective fog pattern no more than 6 feet beyond the nozzle D . extinguishes a fire by absorbing heat and reducing the supply of oxyge

A．东海处于冷锋后 B．东海处于冷锋前的暖区 C．东海处于冷锋前的冷区 D．东海处于暖锋前

A．<0．1 km B．<1 km C．>1 km,<10 km D．<10 km

A．what B． which C． those D． that