In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream,and is called a().
A、seiche
B、bore
C、boundary wave
D、surge
A、seiche
B、bore
C、boundary wave
D、surge
A、the Hudson River B、the Mississippi River C、the Missouri River D、the transcontinental railway
A、A.toward the inside of the bend B、B.toward the outside of the bend C、C.toward the center of the river just before the bend,then change course for the river's center after the bend D、D.in the river's center
A、ignore it and continue mouth-to-mouth ventilation B、pause for a moment until the patient appears quiet again,then resume ventilation mouth-to-mouth C、switch to mouth-to-nose ventilation D、turn the patient's body to the side,sweep out the mouth and resume mouth-to-mouth ventilation
A、A. There are some saws in my toolbox. B、B. There are some pairs of pliers in my toolbox. C、C. There are some spanners in my toolbox. D、D. There are some tools in my toolbox.
A、the minimum depth of the river prescribed in the channel maintenance program B、the edge of a dredged channel C、the highest level to which the river may rise without flooding D、the least available water in a channel which limits the draft of boats and tows
A、running or jumping to create heat B、lying in the sun C、a warm water bath D、mouth-to-mouth resuscitation