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【单选题】
饮水的适宜氟浓度一般应保持在A.
2．1～2．5mg／L
B.
1．6～2．0mg／L
C.
1．1～1．5mg／L
D.
0．5～1．0m／L
E.
0．1～0．4mg／L
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举一反三
【单选题】Which of the following statements about carbon monoxide (CO) poisoning is wrong?
A.
CO, a colorless, odorless gas, is responsible for more than half of yearly deaths due to poisoning worldwide. In the United States alone, nearly 4,000 people succumb to CO poisoning each year, both accidentally and intentionally.
B.
CO has an approximately 2,500-fold greater affinity for hemoglobin than does oxygen. Consequently, relatively low levels of CO can have substantial and tragic effects.
C.
When CO combines with hemoglobin, the complex is referred to as carboxyhemoglobin, or COHb.
D.
In the United States, the government-mandated (Occupational Safety and Health Administration, OSHA) limit for CO at worksites is 50 ppm for people working an eight-hour shift.
【简答题】力和矩都是矢量。 力的三要素: ( ) 、 ( ) 、 ( ) 。 矩的三要素: ( ) 、 ( ) 、 ( ) 。
【简答题】连续时间信号的自变量通常以什么表示?离散时间信号的自变量以什么表示?自变量的取值上有什么区别?
【多选题】销售顾问对客户进行异议处理时会遵循一些原则,常见的原则包括以下哪几项?
A.
理解客户异议
B.
善待客户异议
C.
尊重客户异议
D.
对客户异议据理力争
E.
永不与客户争论异议
【单选题】Staphylococcus aureus is a pathogenic bacterium that can infect a wide range of host species, including humans. S. aureus has a particular protein that binds with hemoglobin from the host organism. He...
A.
Each host transcribes and translates this gene differently.
B.
S. aureus develops a mutualistic relationship with each host species.
C.
Changes in amino acid sequence are unrelated to protein function.
D.
Each strain is best adapted to a specific host species.
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