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【判断题】
直上式楼梯可沿双向前行，并设中间平台。这句话的描述是否正确？A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】When the pressure gets low, the boiling-point becomes low.
【多选题】When the low-carbon steel specimen is stretched and compressed in the axial direction, which of the following options is correct? .
A.
proportional limit s are equal
B.
yield strengths are equal
C.
ultimate strengths are equal
D.
elastic moduli are equal
【判断题】As a rule ,when the pressure of the reservoir is high,the rate of production is low; but when the pressure is low,the rate is high.
A.
正确
B.
错误
【单选题】下列不属于原癌基因与抑癌基因差别的是
A.
在功能上，抑癌基因起负调控作用，而原癌基因起正调控作用
B.
在遗传方式上，原癌基因是显性的，而抑癌基因在细胞水平上是隐性的
C.
在突变发生的细胞类型上，抑癌基因突变可以发生在体细胞中，也可能发生在生殖细胞中并通过生殖细胞得到遗传。原癌基因突变只发生在体细胞中
D.
从表达水平上，原癌基因表达水平高，抑癌基因表达水平低
【简答题】Changes in the prices of goods can cause changes in production and consumption. Production increases when the prices are high. As the prices of goods go up, producers make more goods because they can ...
【单选题】In the Northern Hemisphere, when the low pressure center at your location is northerly, causing the wind is located to your ______.
A.
NNW
B.
WSW
C.
ESE
D.
SSW
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