【单选题】Nitrogen affects underwater divers in that ______.
A.
divers who come to the surface too quickly suffer severe pains
B.
the bloodstream of divers is compressed by excess nitrogen
C.
divers' spinal column is extremely painful for lack of nitrogen
D.
divers experience a condition known as the bends during diving
【判断题】由于市场均衡是需求和供给共同决定的,因此在需求不变的情况下,供给增加必然导致均衡数量减少。
【单选题】According to the article, ______ .
A.
the more experienced divers are the less eye damage they have
B.
divers experience rigidity during diving
C.
differences between individual divers obstructed researchers' work
D.
eye damage can also occur in novice divers
【判断题】由于市场均衡是需求和供给共同决定的,因此在需求不变的情况下,供给增加必然导致均衡数量增加
【单选题】For hundreds of years, pearl divers have gathered pearls directly from mollusks on the seafloor. This is an extremely risky profession, exposing the divers to risks of drowning, air embolism, and shar...
A.
Shark attacks on pearl divers have decreased steadily over the last three decades because of declining shark populations.
B.
Cultured pearls are generally considered more beautiful than those made by artificial means.
C.
Robotic pearl harvesters can gather pearls faster and at less cost than human divers, although they may disturb aquatic communities.
D.
Part of the value of cultured pearls derives from the exotic way in which they are obtained.
E.
With the proper equipment and training, a diver employing scuba gear can harvest three times as many pearls per hour as can a free air diver.
【判断题】由于市场均衡是需求和供给共同决定的,因此再需求不变的情况下,供给增加必然导致均衡数量增加。
【多选题】带教制”这种临床教学的方法,可以帮助学生
【多选题】“带教制”这种临床教学方法,可以帮助学生