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【多选题】
人类对磷循环的影响
A.
循环链断裂风险
B.
农业施肥不能的恶性循环
C.
磷矿石,农药,洗涤剂完成水体富营养化
D.
过渡捕捞改变水生生态系统磷循环
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参考答案:
举一反三
【判断题】关于发票的抬头,若信用证无明确规定时,则以开证行为抬头人。
A.
正确
B.
错误
【单选题】The lawyer seldom wears anything other than a suit ________ the season.
A.
whatever
B.
wherever
C.
whenever
D.
however
【单选题】在机械工程中,有些机构要求自锁,有些则要求防止自锁,试在下列各机构中指出哪些是要求自锁的。 ( )
A.
自卸车的自卸机构
B.
摇臂钻床的摇臂升降
C.
螺旋千斤顶
D.
螺纹联结的螺栓和螺帽
【判断题】关于发票的抬头,若信用证无明确规定,则以开证行为抬头人
A.
正确
B.
错误
【简答题】Unit 3 ... I went snorkelling on the reef offshore this morning. ... Seeing such 小题1: , I think every cell in my body woke up. ... The first thing I 小题2: was all the vivid colours surrounding me—purpl...
【判断题】(冷却系统所有管路和阀门),发现有跑、冒、滴、漏时,必须及时报告当班领导,请求处理。
A.
正确
B.
错误
【单选题】A carbon dioxide fire extinguisher should be recharged ______.
A.
at least annually
B.
whenever it is below its required weight
C.
only if the extinguisher has been used
D.
before every safety inspection
【单选题】________ difficult the situation is, we'll help one another to overcome it. [      ]
A.
Whatever
B.
Whenever
C.
Wherever
D.
However
【判断题】关于发票的抬头,若信用证无明确规定,则以开证行为拾头人。
A.
正确
B.
错误
【单选题】Kate's dad is getting old. She will go back home to see him _____it is convenient.
A.
because
B.
whenever
C.
although
D.
unless
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