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【单选题】
Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. 听力原文：M: No mail for me today? They must have forgotten about me. I hope everything is all right at home. W: No news is good news. Remember many things am slow these days. Q: What can we learn from the conversation? (12)A.
No news is good news.
B.
The woman works in the post office.
C.
The man's family forgot him.
D.
The man expects to hear from his family.
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【单选题】在配货检查方法中( )是最简单的做法即将货品一个个点数并逐一核对出货单进而查验配货的品质及状态情况。
A.
人工检查
B.
商品条形码检查法
C.
声音输入法
D.
重量计算检查法
【单选题】when languae is used to give information about facts, it has f unction.
A.
expressive
B.
informative
C.
interrogative
【单选题】将货品一个个点数并逐一核对出货单,进而查验配货的品质及状态情况的配货检查方 式属于( )。 (1.0 分)
A.
条码检测法
B.
纯人工方式
C.
声音输入检查法
D.
重量计算检查法
【简答题】DNA浓度能够通过紫外分光光度测定法进行测定,对纯净的DNA样品,在波长260 nm和280 nm的吸收值之比(OD260/OD280)应为1.8,如果实际测量时,这个比例小于1.8的话,就表示样品被蛋白质或酚污染了。OD260/OD280比值大于2说明有_______污染。
【简答题】请为电冰箱经销商设计一个数据库,要求包括生产厂商和产品的信息。生产厂商的信息包括厂商名称、地址、电话;产品的信息包括品牌、型号、价格;生产厂商生产某产品的数量和日期。 要求:1)将数据库用E-R图来描述, 2)转换成关系模型并注明码和完整性约束条件。
【单选题】The lungs are important organs, _______ f unction is to take in oxygen and release carbon dioxide.
A.
whom
B.
who
C.
whose
D.
of which
【简答题】DNA 浓度能够通过紫外分光光度测定法进行测定,对纯净的 DNA 样品,在波长 260 nm 和 280 nm 的吸收值之比 (OD260/OD280) 应为 1.8 ,如果实际测量时,这个比例小于 1.8 的话,就表示样品被______ 污染了。 OD260/OD280 比值大于 2 说明有 _______ 污染。
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