现场的各种压力表常用的压力单位是（）。 ["MPa","Pa","P"]
下列有关生态位理论说法中，错误的是：（） ["物种生态位可随发育而改变","互利共生倾向于扩大基础生态位","生态位指种群在系统中所处的时间、空间上的位置及其与相关种群之间的功能关系","缺乏竞争者时，物种可扩大其实际生态位"]
南美洲地形结构的基本特征是什么？
A new ocean going ship of 2000 gross tons having an inoperative oily water separator may dispose of its bilge slops by （）. ["holding its slops onboard until they can be pumped into the city sewer system","circulating them through the lube oil purifier to remove water and debris","holding its slops onboard until they can be discharged to a shore side reception facility","pumping them into a settling tank for separation before pumping the oily water residue overboard"]
生物多样性的主要层次包括：（） ["物种多样性","种群多样性","群落多样性","生态系统多样性","遗传多样性"]
南美洲的地理位置对气候有何影响？
