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【单选题】
牌号为45号的钢属于( )。A.
普通碳素结构钢
B.
优质碳素结构钢
C.
碳素工具钢
D.
铸造碳钢
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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.
【单选题】—I forgot to bring my English book. May I use yours? —_______. [ ]
A.
I don't know
B.
you can't
C.
Here you are
D.
No, you can ask him
【单选题】He forgot about ______ him to attend my wife's birthday party.
A.
I asking
B.
my asking
C.
me to ask
D.
mine to ask
【简答题】目前有( )和FedEx服务商支持快递门到门服务。
【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?
【简答题】下面关于Internet的E-Mail，说法错误的是( )。 A)电子邮件应用程序使用SMTP接收邮件、POP3发送邮件 B)电子邮件应用程序的主要功能是创建、发送、接收和管理邮件 C)电子邮件包括邮件和邮件体两部分 D)利用电子邮件传送多媒体信息
【单选题】Last week I met my old friend Li Ming, but I forgot _____ him for his telephone number. [ ]
A.
ask
B.
asking
C.
asked
D.
to ask
【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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